二维数组的初始化和遍历

public class aaaa {
    public static void main(String aaa[]){
        int[][] a=new int[3][];
        a[0]=new int[]{1,2};
        a[1]=new int[]{3,4,5,6};;
        a[2]=new int[]{7,8,9,10,11};

        int[][]b={
                {1,1,1},{2,2,2,2},{3}
        };

        int[][]c=new int[3][2];
        c[0]=new int[]{5,5,5,5,5};

        //外层foreach，内层foreach
        for (int[] k:a) {
            for (int l:k) {
                System.out.print(l+"\t");
            }
            System.out.println();
        }
        System.out.println();

        //外层for，内层foreach
        for (int i=0;i<b.length;i++){
            for (int k:b[i]) {
                System.out.print(k+"\t");
            }
            System.out.print("\n");
        }
        System.out.println();

        //外层foreach，内层for，注意所有a[]替换为k
        for (int[] k:c) {
            for (int i=0;i<k.length;i++){
                System.out.print(k[i]+"\t");
            }
            System.out.println();
        }
        System.out.println();

    }
}