定义一个标准的类

一个标准的被通常要有以下4部分

1.所有的成员变量需要使用private关键字来修饰
2.为每一个成员变量编写一堆Getter和Setter方法
3.编写一个有参数的构造方法
4.编写一个无参数的构造方法
这样标准的类也叫作 Java Bean

public class Test {
    public static void main(String[] args) {
        Student student = new Student(1, "小明", 17, "男");
        System.out.println(student.getID());
        System.out.println(student.getName());
        System.out.println(student.getAge());
        System.out.println(student.getSex());

        Student st1 = new Student();
        st1.setID(1);
        st1.setName("小红");
        st1.setAge(17);
        st1.setSex("女");
        
        System.out.println(st1.getID());
        System.out.println(st1.getName());
        System.out.println(st1.getAge());
        System.out.println(st1.getSex());
    }
}



class Student{
    private int ID;//学生编号
    private String Name;//学生姓名
    private int age;//学生年龄
    private String sex;//学生性别

    //有参构造
    public Student(int ID, String name, int age, String sex) {
        this.ID = ID;
        Name = name;
        this.age = age;
        this.sex = sex;
    }
    //无参构造
    public Student() {

    }

    //Getter/Setter

    public int getID() {
        return ID;
    }

    public void setID(int ID) {
        this.ID = ID;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }