demo1 toString
class Person {}
public class HelloWorld {
public static void main(String args[]){
Person per = new Person();
System.out.println(per);
System.out.println(per.toString());// Object类继承而来;
}
}
Person@2a139a55
Person@2a139a55
demo2 输出类，默认调取的是toString() 方法
class Person {
private String name;
private int age;
public Person(String name,int age){
this.name = name;
this.age = age;
}
@Override
public String toString(){
return "姓名:" + this.name + ",年龄:" + this.age;
}
}
public class HelloWorld {
public static void main(String args[]){
Person per = new Person("张三",22);
System.out.println(per);// 输出类，默认调取toString方法;
}
}