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;
}

//重寫toString方法
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}

package com.itheima_56;
/*
Object是類層次結(jié)構(gòu)的根，每個類都可以將Object作為超類。所有類都直接或者間接的繼承自該類
看方法的源碼：選中方法，按下Ctrl+B
建議所有子類重寫此方法
如何重寫呢？自動生成即可
*/

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);//默認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());
}

*/
}
}