example_3(实例化同名对象)
实例化同名对象时赋值
public class User { int id; String name; String pwd; public User(){} public User(int id ,String name){ super(); this.id=id; this.name=name; } public User(int id,String name,String pwd){ this.id=id; this.name=name; this.pwd=pwd; } public static void main(String[] args){ User u1=new User(); User u2=new User(10,"ojb"); User u3=new User(100,"100号","123456"); } }