Object

/**
*Object的类是Student隐藏继承
*/
public class Student{ //extends Object{

private String name;private int age;//测式有没有父类public Student(){    super();}//构造器public void Student(String name,int age){    this.name = name ;    this.age = age ;}public void setName(String name){    this.name = name ;}public void setAge(int age){    this.age = age ;}public String getName(){    return name;}public int getAge(){    return age ;}

}
class StudentDemo{

public static void main(String []args){    Student s = new Student();    System.out.println(s);//打印对象的时候，底层输出的其实是调用toString方法。    System.out.println(s.toString());}

}