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public class Main {
    public static void changeValue(int x) {
        x = 100; // change copy
    }

    public static void main(String[] args) {
        int num = 50;
        changeValue(num);
        System.out.println(num); // prints 50 → original not affected
    }
}

public class Main {
    public static void changeArray(int[] arr) {
        arr[0] = 100; // modify original array
    }

    public static void main(String[] args) {
        int[] numbers = {1, 2, 3};
        changeArray(numbers);
        System.out.println(numbers[0]); // prints 100 → original changed
    }
}