为什么这会产生无限循环?

时间:2014-11-07 19:49:20

标签: java infinite-loop

我正在尝试使用方法来创建一个java程序,以便根据3到10之间的用户条目构建一个特定大小的沙漏形图。然而,当我运行程序时,我得到一个无限循环。 / p>

   public static void main(String[] args){

   int height;

   Scanner keyboard = new Scanner(System.in);
   System.out.println("Enter an integer between 3 and 10 to control the" +
                       " heigth of the hour glass: ");
   height = keyboard.nextInt();                    


    line();
    topHalf();
    bottomHalf();
    line();

 }

public static void line() {

  System.out.println("+");
  for (int i = 1; 1<= 10; i++){
     System.out.println("-");

     System.out.println("+");    
       }   
    }


    public static void topHalf()
     {
          for(int line = 1; line <= 3; line++){
          System.out.println("|");
          for (int i = 1; i<= (line - 1); i++){
             System.out.println(" ");
          }
          System.out.println("\\");
          for (int i = 1; i <= (6 - 2 * line); i++){  
             System.out.println(".");
          }
          System.out.print("/");
          for (int i = 1; i <= (line - 1); i++){
             System.out.println(" ");
          }
          System.out.println("|");    
        }
    }

    public static void bottomHalf()
    {
       for (int line = 1; line <= 3; line++){
          System.out.println("|");
          for (int i = 1; i <= (3 - line); i++){
             System.out.println(" ");
          }
          System.out.println("/");
          for (int i = 1; i <= 2 * (line - 1); i++){
             System.out.println(".");
          }
          System.out.println("\\");
          for (int i = 1; i <= (3 - line); i++){
             System.out.print(" ");
          }
        }
    }

 }

我真的不知道发生了什么,但我确定它不是沙漏形状。当我运行它时,唯一发生的事情是+的无限循环然后 - 。非常感谢任何帮助,谢谢!

1 个答案:

答案 0 :(得分:4)

您的1循环条件为i代替for - 1 <= 10始终为真,因此无限循环。你想改变:

for (int i = 1; 1<= 10; i++){

到此:

for (int i = 1; i<= 10; i++){