好的，以下是冒泡排序的 Java 代码实现：

```java
public static void main(String[] args) {
    int[] arr = {5, 3, 8, 6, 4};
    bubbleSort(arr);
    System.out.println(Arrays.toString(arr)); // 输出结果为 [3, 4, 5, 6, 8]
}

public static void bubbleSort(int[] arr) {
    int len = arr.length; // 数组长度
    for (int i = 0; i < len - 1; i++) {
        for (int j = 0; j < len - 1 - i; j++) {
            if (arr[j] > arr[j + 1]) {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
}
```
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