面向对象练习

1、创建School（学校）类，具有名称和地址属性及输出这些信息的功能

public class School {
    String name;//学校名称
    String location;//地址
    public String display(){
        return "学校名称："+name+",地址："+location;
    }
}
class SchoolTest{
    public static void main(String[] args) {
        School school=new School();
        school.name="清华大学";
        school.location="北京";
        System.out.println(school.display());
    }
}

2、创建学员类和教员类，需求见PPT

 

//学员类
public class Student {
    String name;
    int age;
    String grade;
    String hobby;

    public String display() {
        return name + "\n" + "年龄：" + age + "\n" + "就读于：" + grade + "\n" + "爱好：" + hobby;
    }
}

//教员类
public class Teacher {
    String name;
    String specialty;
    String course;
    int age;

    public String display() {
        return name + "\n" + "专业方向：" + specialty + "\n" + "教授课程：" + course + "\n" + "教龄：" + age;
    }
}

//测试类
public class Test {
    public static void main(String[] args) {
        Student student = new Student();
        student.name = "张浩";
        student.age = 10;
        student.grade = "S1班";
        student.hobby = "篮球";
        System.out.println(student.display());
        System.out.println();
        Teacher teacher = new Teacher();
        teacher.name = "王老师";
        teacher.age = 5;
        teacher.specialty = "计算机";
        teacher.course = "使用Java语言理解程序逻辑";
        System.out.println(teacher.display());
    }
}

3、输出门票价格，需求见PPT

 

import java.util.Scanner;

public class Visitor {
    String name;
    int age;

    public void tickets(int age, String name) {
        if (age >= 12 && age <= 100) {
            System.out.println(name + "的年龄为：" + age + ",门票价格为：20元");
        } else if (age >= 0 && age < 12) {
            System.out.println(name + "的年龄为：" + age + ",门票免费");
        }
    }
}

class VisitorTest {
    public static void main(String[] args) {
        Visitor v = new Visitor();
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.print("请输入姓名：");
            String name = sc.next();
            if (name.equals("n")) {
                System.out.println("退出");
                break;
            } else {
                System.out.print("请输入年龄：");
                int age = sc.nextInt();
                v.tickets(age, name);
            }
            System.out.println();
        }


    }
}

4、用户密码管理，需求见PPT

 

import java.util.Scanner;

public class Longin {
    String username1 = "admin1";
    String password1 = "111111";

    public void Login1(String username, String password) {
        if (username.equals(username1) && password.equals(password1)) {
            System.out.println();
            Scanner sc = new Scanner(System.in);
            System.out.print("请输入新密码：");
            String password1 = sc.next();
            System.out.println("修改密码成功，您的新密码为：" + password1);
        } else {
            System.out.println("用户名和密码不匹配！您没有权限更新管理员信息。");
        }
    }

}


class LoginTest {
    public static void main(String[] args) {
        Longin lg = new Longin();
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入用户名：");
        String username = sc.next();
        System.out.print("请输入密码：");
        String password = sc.next();
        lg.Login1(username, password);
    }
}

5、实现简易计算器，通过键盘输入两个整数并完成两个整数[int]的加减乘除四则运算

import java.util.Scanner;

public class JiSuan {
    public int sum(int a, int b) {
        return a + b;
    }

    public int difference(int a, int b) {
        return a - b;
    }

    public int product(int a, int b) {
        return a * b;
    }

    public double quotient(double a, double b) {
        return a / b;
    }
}

class JiSuanTest {
    public static void main(String[] args) {
        JiSuan js = new JiSuan();
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入第一个整数");
        int a = sc.nextInt();
        System.out.print("请输入第二个整数");
        int b = sc.nextInt();
        System.out.println("和：" + js.sum(a, b));
        System.out.println("差：" + js.difference(a, b));
        System.out.println("积：" + js.product(a, b));
        if (b == 0) {
            System.out.println("0不能做除数");
        } else {
            System.out.println("商：" + js.quotient(a, b));
        }

    }
}