[说明]
本程序中预设了若干个用户名和口令。用户输入正确的用户名后，可以查找对应的口令，一旦输入结束标记“end”，程序结束。
[Java代码]
import java. io. *:
public class User
public String user;
public Siring pass;
public User()
public User( String u,String p)
user=u;
pass=p; public String (1) () return this. user;
public String (2) () return this. pass;
public static void main(String[] args)
User ua[]=new User("Li","123456"), new User("wang","654321"),
new User("Song","666666");
while(true)
InputStreamReader reader = new InputStreamReader(System. in);
BufferedReader inpul = new BnfferedReader(reader);
System. out. print("Enter your name:");
String name = null;
try name = input. readLine();
catch (IOException ex)
if( (3) ) break;
int i;
for (i=0;i＜3;i++)
if (name. equals(ua[i]. getUser()))
System. out. println("密码:"+ua[i].getPass());
(4) ;


if ( (5) ) System. out. println("该用户不存在!");