import java.util.*;
import java.io.*;
class Password implements java.io.Serializable{
    String name;
    String password;
    public Password(){name = ""; password = "";}
    public Password(String n, String p){
        name = n;
        password = p;
    }
    public boolean equals(Object p){
        Password pw = (Password)p;
        return name.equals(pw.name) && password.equals(pw.password);
    }
    public String toString(){
        String s = name +" "+password;
        return s;
    }
}

------解决方案--------------------
楼上的代码有人测试了吗？

------解决方案--------------------
参考：
http://school.itzcn.com/special-spid-50.html
上面讲解的比较详细，希望对楼主有所帮助。