二维数组实例

package java_test;class java_test{public static void main(String args[]){int x = 3, y = 5;int i , j;int[][] a = new int[x][y]; for( i = 0; i < x; i++){a[i][0] = 12345678;for( j = 0; j < y; j++){System.out.println("a["+i+"]["+j+"]="+a[i][j]);}}int[][] arr = new int[2][];        arr[0] = new int[3];        arr[1] = new int[5];        for( i = 0; i < 2; i++){arr[i][0] = 12345678;}        for( i = 0; i < 3; i++){        if(i != 0)        arr[0][i] = 3;System.out.println("arr[0]["+i+"]="+arr[0][i]);}        for( i = 0; i < 5; i++){        if(i != 0)        arr[1][i] = 5;System.out.println("arr[1]["+i+"]="+arr[1][i]);}}}