Modifying Elements of an Array Parameter Inside a Method - Java Object Oriented Design

Java examples for Object Oriented Design:Method Parameter

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Description

Modifying Elements of an Array Parameter Inside a Method

Demo Code

import java.util.Arrays;

public class Main {

  public static void main(String[] args) {
    int[] origNum = {1, 2, 3};
    String[] origNames = {"Mike", "John"};
    System.out.println("Before method call, origNum:" + Arrays.toString(origNum));
    System.out.println("Before method call, origNames:" + Arrays.toString(origNames));

    // Call methods passing the arrays
    tryElementChange(origNum);/*from   w  w w . ja v a2s  .c o m*/
    tryElementChange(origNames);

    System.out.println("After method call, origNum:" + Arrays.toString(origNum));
    System.out.println("After method call, origNames:" + Arrays.toString(origNames));
  }

  public static void tryElementChange(int[] num) {
    // If array has at least one element, store 1116 in its first element
    if (num != null && num.length > 0) {
      num[0] = 6;
    }
  }

  public static void tryElementChange(String[] names) {
    if (names != null && names.length > 0) {
      names[0] = "new";
    }
  }
}

Result


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