java - 如何使用 `while` 循环执行此任务？

Question

我不知道如何从 for 循环转换为 while 循环，我的所有尝试都失败了。我有以下代码:

public static void main(String[] args) {
    int[][] arr = new int[4][];
    arr[0] = new int[4];
    arr[1] = new int[2];
    arr[2] = new int[1];
    arr[3] = new int[3];

int counter = 1;

如何将此 for 循环转换为 while 循环？

 //fill arr numbers from 1 to 10
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[i].length; j++) {
                arr[i][j] = counter++;
            }
        }

    for (int i = 0; i < arr.length; i++) {
            System.out.print(" arr [ " + i + " ] = ");
            for (int j = 0; j < arr[i].length; j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println(" ");
        }

    }
}

输出:

arr [ 0 ] = 1 2 3 4  
arr [ 1 ] = 5 6  
arr [ 2 ] = 7 
arr [ 3 ] = 8 9 10

Answer 1

for 循环基本上是一种编写 while 循环的紧凑方式。

for (int i = 0; i < arr.length; i++) { 
  ... 
}

与:

相同

int i=0;
while(i<arr.length){
  ....
  i++;

}