The issue of for-each modify an array of values

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The issue of for-each modify an array of values

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Today write code, I noticed the problem can not be modified for-each array of values, as follows:

public class testForEach {
	public static void main(String[] args) {
		int[] a = new int[5];
		for(int i:a) {
			i=1;
		}
		System.out.println(Arrays.toString(a));
		for(int i=0;i<a.length;i++) {
			a[i]=1;
		}
		System.out.println(Arrays.toString(a));
	}
}

Output:

[0, 0, 0, 0, 0]
[1, 1, 1, 1, 1]

As can be seen, for-each array value can not be modified
in fact:

		for(int i:a) {
			i=1;
		}

equal

		for(int i=0;i<a.length;i++) {
			int b=a[i];
			b=1;
		}

So, just modify the value of the temporary variable, not modify the value inside the array of
conclusions: java in the for-each only through the array, the array of values can not be modified