数组

public class Demo1{
    public static void main(String[] args) {
        //1
        int[] array = new int[3];
        System.out.println(array[0]);//0
        array[0] = 1;
        array[1] = 2;
        array[2] = 3;
        System.out.println(array[2]);
        //2
        int[] array1 = new int[]{1,2,3};
        //3
        int[] array2 = {1,2,3};
        System.out.println(array2.length);//3
/*        String str="";
        System.out.println(str);*/
        System.out.println("*************");
        for (int i=0;i<array2.length;i++) {
            System.out.println(array2[i]);
        }

        for (int i=array2.length-1;i>=0;i--) {
            System.out.println(array2[i]);
        }
        System.out.println(array2[1]);
        //for-each  增强for循环
        for(int num:array2){
            System.out.println(num);
        }
    }
}