How to use the toSpring() method of the Object class in java

Object is the root of the class hierarchy, and each class can have Object as a superclass. All classes directly or indirectly inherit from this class

Constructor method:public Object()

Recall in object-oriented, why is it said that the constructor method of a subclass is accessed by default? Is it the parameterless constructor of the parent class?

Because their top-level parent classes only have no-argument constructors

package com.itheima_56;

public class Student extends Object{
private String name;
private int age;

public Student(){
}

public Student(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 "Student{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}

package com.itheima_56;
/*
Object是类层次结构的根，每个类都可以将Object作为超类。所有类都直接或者间接的继承自该类
看方法的源码：选中方法，按下Ctrl+B
建议所有子类重写此方法
如何重写呢？自动生成即可
*/

public class ObjectDemo {
public static void main(String[] args) {
Student s = new Student();
s.setAge(18);
s.setName("王昱翔");
System.out.println(s);//默认com.itheima_56.Student@5cad8086
System.out.println(s.toString());
/*
public void println(Object x) { //x = s
String s = String.valueOf(x);
synchronized (this) {
print(s);
newLine();
}
}
public static String valueOf(Object obj) { //obj = x;
return (obj == null) ? "null" : obj.toString();
}
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

*/
}
}

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