java array assignment method

In Java, the 6 methods of assigning values ​​to arrays include: direct initialization using loops using the Arrays.fill() method copying from another array using the stream API using third-party tool classes (such as Apache Commons Lang)

Java array assignment methods

In Java, there are many ways to assign values ​​to arrays:

1. Direct initialization

<code class="java">int[] arr = {1, 2, 3, 4, 5};</code>

2. Use loop

<code class="java">int[] arr = new int[5];
for (int i = 0; i < 5; i++) {
    arr[i] = i + 1;
}</code>

3. Use Arrays.fill() method

<code class="java">int[] arr = new int[5];
Arrays.fill(arr, 5); // 将所有元素填充为 5</code>

4. Copy from another array

<code class="java">int[] arr1 = {1, 2, 3, 4, 5};
int[] arr2 = new int[5];
System.arraycopy(arr1, 0, arr2, 0, 5); // 将 arr1 的元素复制到 arr2 中</code>

5. Use streaming API

<code class="java">int[] arr = IntStream.rangeClosed(1, 5).toArray(); // 将整数流转换为数组</code>

6 . Using tool classes

You can use third-party tool libraries (such as Apache Commons Lang) to provide additional array assignment utility methods:

<code class="java">int[] arr = new int[5];
ArrayUtils.add(arr, 1, 2, 3, 4, 5); // 使用 ArrayUtils.add() 逐个添加元素
ArrayUtils.reverse(arr); // 使用 ArrayUtils.reverse() 反转数组</code>

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