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Java语言程序设计与数据结构(基础篇)第11章 课后练习题

文章目录

  • Java语言程序设计与数据结构(基础篇)第11章 课后练习题
    • Test1
    • Test2
    • Test3
    • Test4
    • Test5
    • Test6
    • Test7
    • Test8
    • Test9
    • Test10
    • Test11
    • Test12
    • Test13
    • Test14
    • Test15
    • Test16
    • Test17
    • Test18
    • Test19

Java语言程序设计与数据结构(基础篇)第11章 课后练习题

Test1

package com.programList;

public class Triangle extends GeometricObject {
    private double side1;
    private double side2;
    private double side3;

    public Triangle() {
        this(1.0, 1.0, 1.0);
    }

    public Triangle(double side1, double side2, double side3) {
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    public double getSide1() {
        return side1;
    }

    public double getSide2() {
        return side2;
    }

    public double getSide3() {
        return side3;
    }

    public double getArea() {
        double p = (side1 + side2 + side3) / 2;
        return Math.sqrt(p * (p - side1) * (p - side2) * (p - side3));
    }

    public double getPerimeter() {
        return side1 + side2 + side3;
    }

    public String toString() {
        return "Triangle: side1 = " + side1 + " side2 = " + side2 + " side3 = " + side3;
    }


}

Test2

package com.programList1;

import java.util.Date;

public class Employee extends Person {
    private String office;
    private String wage;
    private Date dateCreated;

    public Employee() {
        office = "";
        wage = "";
        dateCreated = new Date();
    }


    public Employee(String name, String address, String phoneNumber, String mailAddress, String office, String wage, Date dateCreated) {
        super(name, address, phoneNumber, mailAddress);
        this.office = office;
        this.wage = wage;
        this.dateCreated = dateCreated;
    }

    public String getOffice() {
        return office;
    }

    public String getWage() {
        return wage;
    }

    public Date getDateCreated() {
        return dateCreated;
    }

    public void setOffice(String office) {
        this.office = office;
    }

    public void setWage(String wage) {
        this.wage = wage;
    }

    public void setDateCreated(Date dateCreated) {
        this.dateCreated = dateCreated;
    }

    @Override
    public String toString(){
        return "ClassEmployee name: " + getName();
    }

}
package com.programList1;

import java.util.Date;

public class Faculty extends Employee {
    private String officeTime;
    private String level;

    public Faculty() {
    }

    public Faculty(String name, String address, String phoneNumber, String mailAddress, String office, String wage, Date dateCreated, String officeTime, String level) {
        super(name, address, phoneNumber, mailAddress, office, wage, dateCreated);
        this.officeTime = officeTime;
        this.level = level;
    }

    public String getOfficeTime() {
        return officeTime;
    }

    public String getLevel() {
        return level;
    }

    public void setOfficeTime(String officeTime) {
        this.officeTime = officeTime;
    }

    public void setLevel(String level) {
        this.level = level;
    }


    @Override
    public String toString() {
        return "ClassFaculty name: " + getName();
    }
}
package com.programList1;

public class Person {
    private String name;
    private String address;
    private String phoneNumber;
    private String mailAddress;

    public Person() {

    }

    public Person(String name, String address, String phoneNumber, String mailAddress) {
        this.name = name;
        this.address = address;
        this.phoneNumber = phoneNumber;
        this.mailAddress = mailAddress;
    }

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public String getMailAddress() {
        return mailAddress;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public void setMailAddress(String mailAddress) {
        this.mailAddress = mailAddress;
    }

    @Override
    public String toString() {
        return "ClassPerson name:" + getName();
    }

}
package com.programList1;

import java.util.Date;

public class Staff extends Employee {
    private String title;

    public Staff() {
    }

    public Staff(String name, String address, String phoneNumber, String mailAddress, String office, String wage, Date dateCreated, String title) {
        super(name, address, phoneNumber, mailAddress, office, wage, dateCreated);
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return "ClassStaff name: " + getName();
    }

    public static void main(String[] args) {
        Person person = new Person();
        person.setName("张三丰");
        person.setPhoneNumber("000000");
        person.setAddress("zhangsanfeng");
        person.setMailAddress("zhangsanfeng@mail.com");
        System.out.println(person.toString());

        Student student = new Student();
        student.setName("张翠山");
        student.setPhoneNumber("000001");
        student.setAddress("zhangcuishan");
        student.setMailAddress("zhangcuishan@mail.com");
        student.setGrade(3);
        System.out.println(student.toString());

        Employee employee = new Employee("张无忌","zhangwuji","000002","zhangwuji@mail.com","wudangshan","10000",new Date());
        System.out.println(employee.toString());

        Faculty faculty = new Faculty("赵敏","zhaomin","000003","zhaomin@mail.com","yuanchao","10000",new Date(),"9-17","2");
        System.out.println(faculty.toString());

        Staff staff = new Staff("周芷若","zhouzhiruo","000004","zhouzhiruo@mail.com","峨眉山","1000000",new Date(),"掌门人");
        System.out.println(staff.toString());
    }
}
package com.programList1;

public class Student extends Person {
    public static final int Freshman = 1;
    public static final int Sophomore = 2;
    public static final int Junior = 3;
    public static final int Senior = 4;
    private int grade;

    public Student() {
        grade = Freshman;
    }

    public Student(String name, String address, String phoneNumber, String mailAddress, int grade) {
        super(name, address, phoneNumber, mailAddress);
        this.grade = grade;
    }

    public int getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }

    @Override
    public String toString() {
        return "ClassStudent name:" + getName();
    }

}

Test3

package com.programList;

import java.util.Date;

public class Account {
    private int id;
    private double balance;
    private double annualInterestRate;
    private Date dateCreated;

    public Account() {
        id = 0;
        balance = 0;
        annualInterestRate = 0;
        dateCreated = new Date();
    }

    public Account(int id, double balance) {
        this.id = id;
        this.balance = balance;
        annualInterestRate = 0;
        dateCreated = new Date();
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }

    public Date getDateCreated() {
        return dateCreated;
    }

    public double getMonthlyInterestRate() {
        return annualInterestRate / 12;
    }

    public double getMonthlyInterest() {
        return annualInterestRate / 12 * balance;
    }

    public void withDraw(double draw) {
        this.balance -= draw;
    }

    public void deposit(double deposit) {
        this.balance += deposit;
    }

    public static void main(String[] args) {

        Account account = new Account(1122,2000);
        account.setAnnualInterestRate(4.5/100);
        account.withDraw(2500);
        account.deposit(3000);
        System.out.println("Balance: "+account.getBalance());
        System.out.println("Monthly Interest: "+account.getMonthlyInterest());
        System.out.println("Register Date: "+account.getDateCreated().toString());
    }

}
package com.programList;

public class CheckingAccount extends Account{
    private double checklevel;

    public CheckingAccount() {
    }

    public CheckingAccount(int id, double balance, double checklevel) {
        super(id, balance);
        this.checklevel = checklevel;
    }

    public double getChecklevel() {
        return checklevel;
    }

    public void setChecklevel(double checklevel) {
        this.checklevel = checklevel;
    }

}
package com.programList;

public class SavingAccount extends Account{
    //直接继承Account即可
}

Test4

package com.programList;

import java.util.ArrayList;

public class Test4 {
    public static void main(String[] args) {

        ArrayList<Integer> list = new ArrayList<>();
        list.add(2);
        list.add(8);
        list.add(0);
        list.add(-2);
        list.add(2);
        System.out.println(max(list));
    }

    public static Integer max(ArrayList<Integer> list) {
        if (list.size() == 0)
            return 0;
        Integer max = list.get(0);
        for (int i = 1; i < list.size(); i++) {
            if (list.get(i) > max) {
                max = list.get(i);
            }

        }

        return max;
    }
}

Test5

package com.programList;

import java.util.ArrayList;

public class Course {
    //课程名字
    private String courseName;
    //课程学生
    private ArrayList<String> students = new ArrayList<>();
    private int numberOfStudents;

    public Course(String courseName) {
        this.courseName = courseName;
    }

    public void addStudent(String student) {
        students.add(student);
        numberOfStudents++;

    }

    public ArrayList<String> getStudents() {
        return students;
    }

    public int getNumberOfStudents() {
        return numberOfStudents;
    }

    public String getCourseName() {
        return courseName;
    }

    public void dropStudent(String student) {
        students.remove(student);
        numberOfStudents--;
    }

    public void clear() {
        this.students = new ArrayList<>();
        this.numberOfStudents = 0;
    }

    public static void main(String[] args) {
        Course course = new Course("math");
        course.addStudent("张三丰");
        course.addStudent("张翠山");
        course.addStudent("张无忌");
        System.out.println(course.getNumberOfStudents());
        course.dropStudent("张翠山");
        System.out.println(course.getNumberOfStudents());
        System.out.println(course.getStudents().get(0));
        System.out.println(course.getStudents().get(1));

    }
}

Test6

package com.programList;

import java.util.Date;

public class Loan {
    private double annualInterestRate;  //贷款年利率
    private int numberOfYears;  //贷款年数
    private double loanAmount;  //贷款额度
    private Date loanDate;  //创建贷款的日期

    //无参构造方法,默认贷款年利率2.5,贷款年限为1年,贷款额度为1000
    public Loan() {
        this(2.5, 1, 1000);
    }

    //带参构造方法
    public Loan(double annualInterestRate, int numberOfYears, double loanAmount) {
        this.annualInterestRate = annualInterestRate;
        this.numberOfYears = numberOfYears;
        this.loanAmount = loanAmount;
        loanDate = new Date();
    }

    //返回年利率
    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    //设置年利率
    public void setAnnualInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }

    //返回贷款年限

    public int getNumberOfYears() {
        return numberOfYears;
    }

    //设置贷款年限

    public void setNumberOfYears(int numberOfYears) {
        this.numberOfYears = numberOfYears;
    }

    //返回贷款额度

    public double getLoanAmount() {
        return loanAmount;
    }

    //设置贷款额度

    public void setLoanAmount(double loanAmount) {
        this.loanAmount = loanAmount;
    }

    //计算月支付额度
    public double getMonthlyPayment() {
        double monthlyInterestRate = annualInterestRate / 1200;
        double monthlyPayment = loanAmount * monthlyInterestRate / (1 - (1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12)));
        return monthlyPayment;
    }

    //计算总支付额度
    public double getTotalPayment() {
        double totalPayment = getMonthlyPayment() * numberOfYears * 12;
        return totalPayment;
    }

    //返回贷款创建引用
    public Date getLoanDate() {
        return loanDate;
    }

    @Override
    public String toString(){
        return "created on " + getLoanDate().toString() + "\nannualInterestRate: " + getAnnualInterestRate() + "\nnumberOfYears: " + getNumberOfYears() +"\nloanAmount: " + getLoanAmount();
    }
}
package com.programList;


public class Circle extends GeometricObject {
    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

    public Circle(double radius, String color, boolean filled) {
        this.radius = radius;
        setColor(color);    //父类的方法,不能使用this.color = color,因为GeometricObject类中的私有数据域color和filled是不能被其他类访问
        setFilled(filled);  //父类的方法,不能使用this.filled = filled,因为GeometricObject类中的私有数据域color和filled是不能被其他类访问
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public double getArea() {
        return radius * radius * Math.PI;
    }

    public double getDiameter() {
        return 2 * radius;
    }

    public double getPerimeter() {
        return 2 * radius * Math.PI;
    }

    public void printCircle() {
        System.out.println("The circle is created " + getDateCreated() + " and the radius is " + radius);
    }

    public String toString() {
        return super.toString() + "\nradius is " + radius;
    }

}
package com.programList;

import java.util.ArrayList;
import java.util.Date;

public class Test6 {
    public static void main(String[] args) {
        ArrayList list = new ArrayList();
        list.add(new Loan());
        list.add(new Date());
        list.add("字符串");
        list.add(new Circle(5));

        for (Object list1 : list){
            System.out.println(list1.toString());
            System.out.println();
        }

    }
}

Test7

package com.programList;

import java.util.ArrayList;
import java.util.Collections;

public class Test7 {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        list.add(0);
        list.add(1);
        list.add(2);
        list.add(3);
        shuffle(list);
        for (Integer element : list)
            System.out.println(element);
    }

    public static void shuffle(ArrayList<Integer> list){
        Collections.shuffle(list);
    }
}

Test8

package com.programList1;

import java.util.ArrayList;
import java.util.Date;

public class Account {
    private int id;
    private double balance;
    private double annualInterestRate;
    private Date dateCreated;
    private String name;
    private ArrayList<Transcation> transcations;

    public Account() {
        id = 0;
        balance = 0;
        annualInterestRate = 0;
        dateCreated = new Date();
        transcations = new ArrayList<>();
    }

    public Account(int id, double balance) {
        this.id = id;
        this.balance = balance;
        annualInterestRate = 0;
        dateCreated = new Date();
        transcations = new ArrayList<>();
    }

    public Account(int id, double balance, String name) {
        this.id = id;
        this.balance = balance;
        this.name = name;
        annualInterestRate = 0;
        dateCreated = new Date();
        transcations = new ArrayList<>();
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setTranscations(ArrayList<Transcation> transcations) {
        this.transcations = transcations;
    }

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }

    public Date getDateCreated() {
        return dateCreated;
    }

    public String getName() {
        return name;
    }

    public ArrayList<Transcation> getTranscations() {
        return transcations;
    }

    public double getMonthlyInterestRate() {
        return annualInterestRate / 12;
    }

    public double getMonthlyInterest() {
        return annualInterestRate / 12 * balance;
    }

    public void withDraw(double draw,String description) {
        this.balance -= draw;
        transcations.add(new Transcation(new Date(),'W',draw,balance,description));
    }

    public void deposit(double deposit,String description) {
        this.balance += deposit;
        transcations.add(new Transcation(new Date(),'D',deposit,balance,description));
    }

    public static void main(String[] args) {

        Account account = new Account(1122,2000);
        account.setAnnualInterestRate(4.5/100);
        account.withDraw(2500,"取钱");
        account.deposit(3000,"存钱");
        System.out.println("Balance: "+account.getBalance());
        System.out.println("Monthly Interest: "+account.getMonthlyInterest());
        System.out.println("Register Date: "+account.getDateCreated().toString());
    }

}

Test9

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test9 {
    public static void main(String[] args) {
        System.out.print("Enter the array size n: ");
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int[][] matrix = new int[n][n];

        ArrayList<Integer> rows = new ArrayList<>();
        ArrayList<Integer> columns = new ArrayList<>();

        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++)
                matrix[i][j] = (int) (Math.random() * 2);
        }

        for (int i = 0; i < n; i++) {
            int sum = 0;
            for (int j = 0; j < n; j++) {
                if (matrix[i][j] == 1)
                    sum++;
            }

        }

        for (int j = 0; j < n; j++) {
            int sum = 0;

            for (int i = 0; i < n; i++) {
                if (matrix[i][j] == 1)
                    sum++;
            }
            columns.add(sum);

        }

        System.out.println("The random array is ");
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }

        System.out.println("The largest row index: " + java.util.Collections.max(rows));
        System.out.println("The largest column index: " + java.util.Collections.max(columns));
    }

}

Test10

package com.programList1;

import java.util.ArrayList;

public class MyStack extends ArrayList {
    public boolean isEmpty() {
        return super.isEmpty();
    }

    public int getSize() {
        return super.size();
    }

    public Object peek() {
        return super.get(getSize() - 1);
    }

    public Object pop(){
        Object o = peek();
        super.remove(o);
        return o;
    }

    public void push(Object o){
        super.add(o);
    }

    @Override
    public String toString(){
        return "stack: " + super.toString();
    }

    public static void main(String[] args) {
        MyStack myStack = new MyStack();
        myStack.push(1);
        myStack.push(2);
        System.out.println(myStack.peek());
        myStack.pop();
        System.out.println(myStack.getSize());
    }
    
}

Test11

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test11 {
    public static void main(String[] args) {
        System.out.print("Enter 5 integers: ");
        Scanner input = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            Integer n = input.nextInt();
            list.add(n);
        }
        sort(list);
        for (int i = 0; i < 5; i++)
            System.out.println(list.get(i));
    }

    public static void sort(ArrayList<Integer> list) {
        java.util.Collections.sort(list);
    }

}

Test12

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test12 {
    public static void main(String[] args) {
        System.out.print("Enter 5 doubles: ");
        Scanner input = new Scanner(System.in);
        ArrayList<Double> list = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            double n = input.nextDouble();
            list.add(n);
        }
        double sum = sum(list);
        System.out.println("The sum is " + sum(list));
    }

    public static double sum(ArrayList<Double> list) {
        double n1 = 0;
        for (double n2 : list)
            n1 += n2;
        return n1;
    }

}

Test13

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test13 {
    public static void main(String[] args) {
        System.out.print("Enter 10 integers: ");
        Scanner input = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<>();
        
        for (int i = 0; i < 10; i++) {
            int n = input.nextInt();
            list.add(n);
        }
        
        removeDuplicate(list);
        
        System.out.print("The distinct integers are ");
        for (Integer integer : list)
            System.out.print(integer + " ");
    }
    public static void removeDuplicate(ArrayList<Integer> list) {
        int index = 0;
        while (index < list.size()) {
            int number = list.get(index);
            if (list.indexOf(number) != index)
                list.remove(index);//number在下标index之前已经出现过
            else
                index++;
        }
    }

}

Test14

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test14 {
    public static void main(String[] args) {
        System.out.print("Enter five integers for list1: ");
        Scanner input = new Scanner(System.in);
        ArrayList<Integer> list1 = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            int n = input.nextInt();
            list1.add(n);
        }

        System.out.print("Enter five integers for list2: ");
        ArrayList<Integer> list2 = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            int n = input.nextInt();
            list2.add(n);
        }

        ArrayList<Integer> list = union(list1, list2);
        System.out.print("The combined list is ");

        for (Integer i : list)
            System.out.print(i + " ");
    }

    public static ArrayList<Integer> union(ArrayList<Integer> list1, ArrayList<Integer> list2) {
        ArrayList<Integer> list = new ArrayList<>();
        list.addAll(list1);
        list.addAll(list2);
        return list;
    }
}

Test15

Test16

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test16 {
    public static void main(String[] args) {
        int number1 = (int) (Math.random() * 10);
        int number2 = (int) (Math.random() * 10);

        Scanner input = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<>();

        System.out.print("What is " + number1 + " + " + number2 + "? ");
        int answer = input.nextInt();
        list.add(answer);
        while (number1 + number2 != answer) {
            System.out.print("Wrong answer. Try again. What is " + number1 + " + " + number2 + "? ");
            answer = input.nextInt();
            list.add(answer);
            if (list.indexOf(answer) != -1) {
                System.out.println("You already entered " + answer);
            }
        }
        System.out.println("You got it!");
    }
}

Test17

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test17 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter an integer m:");
        int m = input.nextInt();
        int mTemp = m;
        ArrayList<Integer> list = new ArrayList<>();

        for (int i = 2; i <= m; ) {
            if (m % i == 0 && isPrime(i)) {
                list.add(i);
                m /= i;
                i = 2;
            } else {
                i++;
            }
        }


        int[] divisor = new int[list.get(list.size() - 1) + 1];

        for (int i = 0; i < list.size(); i++) {
            divisor[list.get(i)]++;
        }

        int n = 1;
        for (int i = 0; i < divisor.length; i++) {
            if (divisor[i] % 2 == 1) {
                n *= i;
            }
        }

        System.out.println("The smallest number n for m * n to be a perfect square is " + n);
        System.out.println("m * n is " + (mTemp * n));

    }

    public static boolean isPrime(int number) {
        for (int divisor = 2; divisor <= number / 2; divisor++) {
            if (number % divisor == 0) {
                return false;
            }
        }
        return true;
    }
}

Test18

package com.programList;

import java.util.ArrayList;

public class Test18 {
    public static void main(String[] args) {
        ArrayList<Character> list = toCharacterArray("abc");
        for (int i : list)
            System.out.println((char) i);
    }

    public static ArrayList<Character> toCharacterArray(String s) {
        ArrayList<Character> list = new ArrayList<>();
        for (int i = 0; i < s.length(); i++)
            list.add(s.charAt(i));
        return list;
    }

}

Test19

package com.programList;

import java.util.ArrayList;
import java.util.Scanner;

public class Test19 {
    public static void main(String[] args) {
        ArrayList<Container> list = new ArrayList<>();
        list.add(new Container());
        System.out.print("Enter the number of the objects: ");
        Scanner input = new Scanner(System.in);
        int num = input.nextInt();
        System.out.print("Enter the weights of the objects: ");
        for (int i = 0; i < num; i++) {
            double n = input.nextDouble();
            boolean in = false;
            for (Container list2 : list) {
                if (list2.w >= n) {
                    list2.list.add(n);
                    list2.w -= n;
                    in = true;
                    break;
                }
            }
            if (!in) {
                Container list3 = new Container();
                list3.w -= n;
                list3.list.add(n);
                list.add(list3);
            }
        }
        int index = 1;
        for (Container list4 : list) {
            System.out.print("Container " + index + " contains objects with weight ");
            index++;
            for (double i : list4.list)
                System.out.printf("%.0f ", i);
            System.out.println();
        }
    }


}

class Container {
    public double w = 10;
    public ArrayList<Double> list;
    
    public Container() {
        list = new ArrayList<>();
    }
}

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