Question

因此，我完成了一项作业，并且可以运行，但是必须有一种更简单的方法来执行此操作；对？该程序要求用户输入1到50之间的数字，并根据该数字打印星号行，以形成等腰三角形。如果数字超出范围，也应该给出一个错误，并询问用户是否要再次输入。它已经完成了，但是对于预期的目的似乎很长。

public static void main(String[] args) 
{
    //Declare the variables
    //variable to store input character
    int answer; //variable to identify out and the option to run again


    answer = 0;



    //Main body to show description of program and author
    while(answer == JOptionPane.YES_OPTION)
    {
      JOptionPane.showMessageDialog(null, "This program will diplay an isoceles triangle by printing rows of asterisks according to the number entered", "Program by: Ehlert Donald J",
                    JOptionPane.PLAIN_MESSAGE);

      String inputText = JOptionPane.showInputDialog("Input an integer from one to 50: ");

      int inputNumber = Integer.parseInt(inputText);


      if (inputNumber > 50)
       {     
         //Dialog box to ask the user if they want to run the program again
         answer = JOptionPane.showConfirmDialog(null, 
            "Would you like to try and enter a valid number?",
            "Wrong",
            JOptionPane.INFORMATION_MESSAGE);         
        }
      else 
       {
            for(int i=1;i<=inputNumber;i++)
           { 
              for(int j=1;j<=inputNumber;j++)
               {
                  if(j<=i)
                  System.out.print("*");
               }
              System.out.println();
           } 
           for(int i=1;i<=inputNumber;i++)
           {
                for(int j=1;j<=inputNumber;j++)
                {
                   if(j>i) 
                System.out.print("*");
                }
           System.out.println();
           }

          answer = JOptionPane.showConfirmDialog(null, 
            "Would you like to enter another number?",
            "Right",
            JOptionPane.INFORMATION_MESSAGE);
      }
    }

}

Answer 1

我不确定输出应该是什么样，但这是打印“实心”三角形的一种非常简单的方法...

public void printTriangle(int size)
{
    char[] line = new char[size];
    for(int i=0;i<size;i++) line[i] = ' ';

    int height = size/2;
    int middle = size/2;

    for(int i=0;i<height;i++)
    {
        line[middle + i] = '*';
        line[middle - i] = '*';
        System.out.println(line);
    }

    line[0] = '*';
    line[size-1] = '*';
    System.out.println(line);
}

如果要打印边框而不是实心三角形，则可以使用：

line[middle + i] = '*';
line[middle - i] = '*';
System.out.println(line);
line[middle + i] = ' ';
line[middle - i] = ' ';

这不能正确处理偶数，但是您没有提及该怎么做！

在Java中输出星号三角形的更简单方法：

1 个答案: