Rotating Array by a given angle(90, 180, 270, 360 degree)

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import java.io.IOException; import java.util.Scanner; public class Main { public static void main(String[] arg) throws IOException { int n; int[][] a; int r; Scanner sc = new Scanner(System.in); // 입력받는부분 n = sc.nextInt(); a = new int[n][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) a[i][j] = sc.nextInt(); } for (;;) { r = sc.nextInt(); if (r == 0) break; // 여기서부터작성 int[][] tempA = new int[n][n]; int rowXDefault = 0; int rowYDefault = 0; int rowXIncrement = 0; int rowYIncrement = 0; int colXIncrement = 0; int colYIncrement = 0; if(r == 90){ rowXDefault = 0; rowYDefault = n -1; rowXIncrement = -1; rowYIncrement = -1; colXIncrement = +1; colYIncrement = -1; }else if(r == 180){ rowXDefault = n- 1; rowYDefault = n -1; rowXIncrement = -2; rowYIncrement = 0; colXIncrement = 0; colYIncrement = -2; }else if(r == 270){ rowXDefault = n - 1; rowYDefault = 0; rowXIncrement = -1; rowYIncrement = +1; colXIncrement = -1; colYIncrement = -1; }else if(r == 360){ //leave them } for (int i = 0; i < n; i++) { int indexX = rowXDefault; int indexY = rowYDefault; for (int j = 0; j < n; j++) { tempA[i + indexX][j + indexY] = a[i][j]; indexX += colXIncrement; indexY += colYIncrement; } rowXDefault += rowXIncrement; rowYDefault += rowYIncrement; } a = tempA; // 출력하는부분 for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { System.out.print(a[i][j] + " "); } System.out.println(); } } sc.close(); } }