1.for loop
public static void show1(int[][] array){ for(int i = 0;i < array.length;i++){ for(int j = 0;j < array[i].length;j++){ System.out.print(array[i][j]+" "); } System.out.println(); } }
2.clone()
/** * 使用数组本身的 clone() 方法 * * @param sourceArr 源数组 * @param destArr 目标数组 */ public static void copy3(int[][] sourceArr, int[][] destArr) { for (int i = 0; i < sourceArr.length; i++) { destArr[i] = sourceArr[i].clone(); } }
3.Arrays.arraycopy
int[][] array = {{1,2,3},{4,5,6}}; int[][] array2 = new int[2][3]; for(int i = 0;i < array.length;i++){ System.arraycopy(array[i], 0, array2[i], 0, array[i].length);
4. Speed comparison
arraycopy source code, this method copies the fastest and has no return value.
@HotSpotIntrinsicCandidate public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length);
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