package com.liaojianya.chapter1;/** * This program demonstrates the correct use of construct overload.  * @author LIAO JIANYA * 2016年7月21日 */public class ConstructOverload{	public static void main(String[] args)	{		Person2 p = new Person2();		Person2 p1 = new Person2(33);		Person2 p2 = new Person2("wangxiaoyuan", 23);		p.talk();		p1.talk();		p2.talk();	}}class Person2{	private String name;	private int age;		public Person2()	{		name = "zhangsan";		age = 22; 	}		public Person2(int age)	{		name = "wangyuan";		this.age = age;	}		public Person2(String name, int age)	{		this.name = name;		this.age = age;	}		public void talk()	{		System.out.println("My name is " + name + ", I am " + age + " years old.");			}	}

　　运行结果：

My name is zhangsan, I am 22 years old.My name is wangyuan, I am 33 years old.My name is wangxiaoyuan, I am 23 years old.

　　分析：1、第一个构造方法是无参构造，第二个，第三个是有参构造，当对象实例化时，根据new出来对象中是否无参还是有参以及参数个数来调用对应的构造方法。

　　　　　2、三个构造方法形成了构造方法的重载。