学校作业[求助]急~拜托~作业一下3题又要考期中考

public class Test{

  public static void main(String[] args) throws Exception{
    Test t = new Test();

    String stPassword = "0123";
    int iTryTime=0,iTryLimit=3;
    boolean bSuccessLogin = false;

    java.io.BufferedReader input = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
    System.out.print("user login..\r\n");

    do{
      System.out.print("please enter password:");
      String stTemp = input.readLine();
      if(stTemp==null || !stTemp.equals(stPassword)){
        iTryTime++;
        System.out.print("error password, access denied!\r\n");
      }
      else{
        bSuccessLogin = true;
        break;
      }
    }while(iTryTime<iTryLimit);

    if(bSuccessLogin){
      System.out.print("\r\nlogin success.");
    }
    else{
      System.out.print("\r\nlogin fail.");
    }
  }



}