public class Object_toString_Demo {
    public static void main(String[] args) {
        day d = new day();
        System.out.println(d);//不写默认执行对象的toString方法
        System.out.println(d.toString());//toString方法对我们没有意义，需要重新方法。
                                         //查看源码：ctrl+点击toString

        Student s = new Student();
        s.name = "aa";
        s.age = 12;
        System.out.println(s);//不写默认执行对象的toString方法
        System.out.println(s.toString());
    }
}

class day {//所有的类都默认继承的Object类，如果继承了指定类就使用其他类（总会有一个父类没有继承，它就继承Object）
    int time;
}

//重建Object的toString方法快捷方式：鼠标右键Generate---toString
class Student extends Object {
    String name;
    int age;

    @Override
    public String toString() {
        return "student{" +
                "name=‘" + name + ‘\‘‘ +
                ", age=" + age +
                ‘}‘;
    }
}

public class Object_Equals_Demo {
    public static void main(String[] args) {
        Student2 s = new Student2();
        Student2 s2 = new Student2();
        boolean flag = s.equals(s2);
        System.out.println(s + "| |" + s2 + "| |" + flag);
    }
}

class Student2 {
    String name;
    int age;

}