import java.util.Arrays;
public class Two_dimensional_array {
public static void main(String[] args) {
//二维数组的定义
int twoDimArray[][] = new int[3][5];
int[][] twoDimArray1 = {{1,3}, {22,56,47}, {0}};
int[][] twoDimArray2 = new int[][]{{1,3}, {22,56,47}, {0}};
double[][] dwa ;
dwa = new double[][]{{1.0,3.1}, {22.4,56.7,47.8}, {0.0}};
int[][] twoDimArray3;
twoDimArray3 = new int[][]{{1,3}, {22,56,47}, {0}};
//二维数组的下标访问
int[][] test_dArray_index = {{1,3}, {22,56,47}, {0}};
// test_dArray_index[1] == {22,56,47};
// test_dArray_index[1][0] == 22; ==> {22,56,47}[0];
//二维数组的遍历
int[][] test_twoDimArray1 = {{1,3,7}, {22,56,47,4}, {0,1}};
for(int i=0; i=0; i--){
// Arrays.sort(Darr_test[i]);
// }
// Arrays.sort(Darr_test);
System.out.println(Arrays.toString(Darr_test));
for(int i=0; i=0; i--){
// System.out.println(Arrays.toString(Darr_test[i]));
// }
//equals方法不能直接比较两个二维数组是否相等，因为它比较的是内存地址。
int[][] arr_equal1 = {{79,3},{80,1,4,9},{7},{0,0,0}};
int[][] arr_equal2 = {{79,3},{80,1,4,9},{7},{0,0,0}};
boolean isEqual = Arrays.equals(arr_equal1, arr_equal2);
// System.out.println(arr_equal1);
// System.out.println(arr_equal2);
// System.out.println("arr_equal1:"+Arrays.toString(arr_equal1));
// System.out.println("arr_equal2:"+Arrays.toString(arr_equal2));
System.out.println(isEqual);
//fill方法不能直接用于二维数组
// int[] arr_fill = new int[3];
// int[] small_arr = new int[1];
// Arrays.fill(arr_fill, small_arr);
int[][] test_fill = new int[3][2];
for(int i=0; i
