重新運行我的主要方法我boxPrint方法

Question

嗨，我試圖讓這個通過我的代碼RELOOP之後，但它似乎只是退出它打印後的框中輸入：

import java.util.Scanner; 

public class BoxPrint1 { 

    public static void main(String[] args)  
    { 
     Scanner input = new Scanner(System.in);// create scanner object called input 
     // delcare variables 

     int column; 
     int row;  

     System.out.printf("%nThis program prints a box");  // prompt user for input 
     System.out.printf("%n Please enter # of columns (< 1 to exit):"); 
     column = input.nextInt(); 
     System.out.printf("%n Please enter # of rows (< 1 to exit):"); 
     row = input.nextInt(); 
     boxPrint(column, row); 

     while(column > 0 && row > 0); 
     { // calls boxPrint method and passes two arguments 
      // prompt user for input 
      System.out.printf("%n Please enter # of columns (< 1 to exit):"); 
      column = input.nextInt(); 
      System.out.printf("%n Please enter # of rows (< 1 to exit):"); 
      row = input.nextInt(); 
     } 
    }// end main 


    public static void boxPrint(int column, int row) 
    { 
     //insert nested for loops below 
     for(int i = 0; i < row; i++) 
     { 
      for(int j = 0; j < column; j++) 
      { 
        // prints * j times in a row 
       System.out.printf("*"); 
      } 
     System.out.println(); 
     } // end boxPrint method 
    } 
    // end class BoxPrint1 
} 

這是我的代碼，通常我得到輸出（它應該輸出）

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等等，但它不會回到我的主要方法，並再次要求輸入？

Answer 1

變化的主要方法如下所示

public static void main(String[] args) { 
    Scanner input = new Scanner(System.in);// create scanner object called input 
    // delcare variables 

    int column; 
    int row; 

    System.out.printf("%nThis program prints a box");  // prompt user for input 
    do { 
     System.out.printf("%n Please enter # of columns (< 1 to exit):"); 
     column = input.nextInt(); 
     System.out.printf("%n Please enter # of rows (< 1 to exit):"); 
     row = input.nextInt(); 
     boxPrint(column, row); 
    } while (column > 0 && row > 0); 
} 

Answer 2

這可能是因爲你的while循環檢查後提出了一個分號。 它並沒有進入while循環，以提示您再次輸入輸入。