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private static int[] argumentTest(int[] input){

System.out.println("here come the input's items :");
for (int i : input)
System.out.print(i + " ");
System.out.println();

input = new int[]{1,2,3};

System.out.println("the input's reference has been changed here, you can see the current input's items :");
for (int i : input)
System.out.print(i + " ");
System.out.println();

return input;
}

public static void main(String[] args) {

int[] input = new int[]{3,2,1};

int[] output = argumentTest(input);

System.out.println("the input's reference has been changed in function argumentTest,but out of the function, the input remains the same as the one before invoked by argumentTest :");


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