?? demo.java
字號:
class RunDemo
{ private String userName,password;
//RunDemo( )
//{ System.out.println("All is null!");
//}
RunDemo(String name)
{ userName=name;
}
RunDemo(String name,String pwd)
{ this(name);
password=pwd;
check( );
}
void check( )
{ String s=null;
if(userName!=null)
s="userName:"+userName;
else
s="please input your password!";
if(password!="ThisWord")
s=s+" invaid!";
else
s=s+" password:********";
System.out.println(s);
}
}
class RunDemo1 extends RunDemo{
RunDemo1(){super();}
}
public class Demo
{ public static void main(String args[ ])
{ new RunDemo1( );
//new RunDemo("Bill");
//new RunDemo(null,"Bill");
// new RunDemo("Bill","ThisWord");
}
}
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