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45 lines
986 B
45 lines
986 B
package class40;
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public class Code06_RotateMatrix {
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public static void rotate(int[][] matrix) {
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int a = 0;
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int b = 0;
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int c = matrix.length - 1;
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int d = matrix[0].length - 1;
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while (a < c) {
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rotateEdge(matrix, a++, b++, c--, d--);
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}
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}
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public static void rotateEdge(int[][] m, int a, int b, int c, int d) {
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int tmp = 0;
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for (int i = 0; i < d - b; i++) {
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tmp = m[a][b + i];
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m[a][b + i] = m[c - i][b];
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m[c - i][b] = m[c][d - i];
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m[c][d - i] = m[a + i][d];
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m[a + i][d] = tmp;
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}
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}
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public static void printMatrix(int[][] matrix) {
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for (int i = 0; i != matrix.length; i++) {
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for (int j = 0; j != matrix[0].length; j++) {
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System.out.print(matrix[i][j] + " ");
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}
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System.out.println();
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}
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}
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public static void main(String[] args) {
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int[][] matrix = { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 }, { 13, 14, 15, 16 } };
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printMatrix(matrix);
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rotate(matrix);
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System.out.println("=========");
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printMatrix(matrix);
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}
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}
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