toString方法

//Student2类
/*
* 一般情况下toString方法堆我们来说没有什么用，所以要重写toString方法
* Alt+enter
* Alt+insert
* */
public class Student2 extends Object{
    private String name;
    private int age;

    public Student2() {
        super();
    }

    public Student2(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
    //重写toString方法
    @Override
    public String toString() {
        return "name = "+name+";"+"age = "+age+";";
    }

    //通常情况下toString方法不用手动执行，Alt+insert，下面这是源码
    public String toString2() {
        return "Student2{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

//测试类

public class Student2_Test {
    public static void main(String[] args) {
        Student2 s1 = new Student2("陈言",18);
        Student2 s2 = new Student2("哈哈",17);
        System.out.println(s1.toString());//name = 陈言;age = 18;
        System.out.println(s2.toString());//name = 哈哈;age = 17;
        //如果直接打印对象的话，那么其实就是在打印该对象的toString方法的返回值
        System.out.println("-----------------");
        System.out.println(s1);//name = 陈言;age = 18;
        System.out.println(s2);//name = 哈哈;age = 17;
    }
}