Question

Java uses pass by value to pass parameters to a method. What are the important differences between passing a value of variables of primitive data types and passing arrays? Use a specific example to explain

Answer 1

When we do pass by value with primitive than changes made at that method will not have impact at caller side

where if we pass array as call by value than changes made at that method will have impact it caller side

Example:

public class CallByValue {
        public static void main(String[] args) {
                int arr[]= {1,2};
                int x=10;
                System.out.println("Before Call: ");
                System.out.println(x);
                System.out.println(arr[0]+" "+arr[1]);
                change(x);
                change(arr);
                System.out.println("After Call: ");
                System.out.println(x);
                System.out.println(arr[0]+" "+arr[1]);
                
                
        }

        private static void change(int[] arr) {
                arr[0]=100;
                arr[1]=200;
        }

        private static void change(int x) {
                x=100;
        }
}

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