如何用JAVA对3*4二维数组转置输出?答:public static void main(String[] args) { int[][]arr = new int[][]{{1,2,3,4},{5,6,7,8},{9,10,11,12}};int[][]arr2 = new int[arr[0].length][arr.length];showArr(arr);System.out.println("---");for (int i = 0; i < arr[0].length; i++) { for (...