如何让这个二维数组向右旋转 90 度? [英] How do I get this 2D Array to rotate to the right 90 degrees?

问题描述

所以我有一个二维数组，它应该向右旋转 90 度，但它向左旋转.实在想不通为什么

So I have a 2D array, and it is supposed to rotate to the right 90 degrees, but instead it rotates to the left. Really can't figure out why

公共类 CrackCode16 {

public class CrackCode16 {

public static void main (String args[]){
    int [] [] oldarray = new int [3][3];

    int value = 1;

    for (int i = 0; i < 3; i++){
        for (int j =0; j<3; j++){
            oldarray[i][j] = value;
            value++;
        }
    }


    for (int i = 0; i < 3; i++){
        for (int j =0; j<3; j++){
            System.out.print(oldarray[i][j] + "	");
        }
        System.out.println("");
    }


    oldarray = rotate(oldarray, 3);


    System.out.println("");
    for (int i = 0; i < 3; i++){
        for (int j =0; j<3; j++){
            System.out.print(oldarray[i][j] + "	");
        }
        System.out.println("");
    }

}

public static int [][] rotate (int [][] passedIn, int n){

    int [][] newarray = new int [n][n];

    for (int i = 0; i < n; i++){
        for (int j =0; j<n; j++){
            newarray[i][j] = passedIn [j][n-1-i];
        }
    }   

    return newarray;
}

}

输出:

1 2 3
4 5 6
7 8 9

1 2 3
4 5 6
7 8 9

3 6 9
2 5 8
1 4 7

3 6 9
2 5 8
1 4 7

推荐答案

newArray[i][j] = passedIn [n-1-j][i];

代替

newarray[i][j] = passedIn [j][n-1-i];

此外，在使用 Java8 时，您可能会考虑使用 Stream 来打印您的数组:

Additionally, when working with Java8, you might consider using a Stream to print your array:

Stream.of(oldarray).forEach(e -> System.out.println(Arrays.toString(e)));

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