004-006-003

Array Assignment: Reference Copy

Easy

Problem Description

Array Assignment: Reference Copy

Learning Objective: Understand that array assignment copies the reference, not the content

Overview

When you assign an array variable to another variable, the reference (memory location) is copied, not the array content. Therefore, changing one array affects the other.

Specifications

Initialize integer array original with {10, 20, 30}
Assign original to another array variable copy
Change copy[0] to 100
Output the first element of both arrays

Output Format

original[0]: 100
copy[0]: 100

Test Cases

※ Output examples follow programming industry standards

Input:

Expected Output:

original[0]: 100
copy[0]: 100

❌ Some tests failed

❌ エラー発生

Your Solution

Current Mode:● My Code

public class Main {
  public static void main(String[] args) {
  // original 配列を初期化
  int[] original = {10, 20, 30};
  // 代入: 配列 変数 (reference copy)
  int[] copy = original;
  // copy's 要素を変更
  copy[0] = 100;
  // 両方の配列の最初の要素を出力
  System.out.println("original[0]: " + original[0]);
  System.out.println("copy[0]: " + copy[0]);
  }
}

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