Java当中的数组

1 class Test{
2     public static void main(String args []){
3         int arr [] = {5,6,7,2,34,3,5,34,5,4};   //数组静态定义法
4         for(int i=0;i<arr.length;i++){
5             System.out.println(arr[i]);
6         }
7     }
8 }

1 class Test{
2     public static void main(String args []){
3         //int arr [] = {5,6,7,2,34,3,5,34,5,4}; 
4         int arr [] = new int[10] ;   //数组动态定义法
5         for(int i=0;i<arr.length;i++){
6             System.out.println(arr[i]);   //将会打印出10个0 
7         }
8     }
9 }

1 class Test{
2     public static void main(String args []){
3         int arr [][]={{1,2,3},{4,5,6},{7,8,9}}; //注意里面也是花括号
4         System.out.println(arr[1][1]);  //arr[1]代表{4,5,6}.arr[1][1]代表5
5     }
6 }

 1 class Test{
 2     public static void main(String args []){
 3         int arr [][]={{1,2,3},{4,5,6},{7,8,9}}; 
 4         for(int i=0;i<arr.length;i++){   //这里值得注意下！！！
 5             for(int j=0;j<arr[i].length;j++){
 6                 System.out.println(arr[i][j]);
 7             }
 8         }          
 9     }
10 }