java，

java，

package 练习;

public class 练习 {

    public static void main(String[] args) {
        //  0    1  2  3  4  5 
int []numbers= {11,23,3,12,12,7};
System.out.println(numbers[2]);

for (int i=0;i<numbers.length;) {
System.out.println(numbers[i]);

for (int a=0;a<=numbers.length-1;a++) {
System.out.println(numbers[a]);    
}
}

//int []numbers= {11,23,3,12,7};
int []numbers1=new int[5];
System.out.println(numbers[numbers.length-1]);

for (int i=0;i<numbers.length;i++) {
    System.out.println(numbers[i]+",");
}

 

int[][]arr= {{1,2,3},{4,5,6},{7,8,9}};
System.out.println(arr[1][1]);

for (int i=0;i<arr.length;i++) {
    for (int j=0; j<arr[i].length;j++) {
        System.out.println(arr[i][j]);
    }
}
int [][]arr1=new int [4][5];

for (int i=0;i<arr1.length;i++) {
    for (int j=0; j<arr1[i].length;j++) {
        arr1[i][j]=i*j;
        System.out.println(arr1[i][j]);
    }
}

 

    }

}