toString方法返回该对象的字符串表示,如果不用toString则返回的是地址 package Xuexi; public class Person { private String name; private int 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; } public String toString(){ String str=this.name+"..."+this.age; return str; } } package Xuexi; public class Test01 { public static void main(String[] args) { // TODO Auto-generated method stub Person p1=new Person(); String str=p1.toString(); System.out.println(str); } }