小编Bri*_*anS的帖子

我试图使用for循环初始化整数java数组中的对象,但在for循环退出后数组元素为null.

public static void main(String[] args) {
    Integer[] x = new Integer[1];
    for (Integer xx : x) {
        xx = new Integer(1);
        System.out.println("inside for loop "+xx.toString());
    }
    System.out.println("why isn't this 1?  " + x[0]);

    x[0] = new Integer(2);
    for (Integer xx : x) {
        System.out.println("Not it's okay: " + xx.toString());
    }
}

但是在for循环退出后,数组元素为null.这是输出:

inside for loop 1
why isn't this 1?  null
Not it's okay: 2

为什么这个for循环的行为不一样for (i=0;i<1;i++){x[i]=1;} ？