java怎么将数组变成字符串

<code class="java">int[] arr = {1, 2, 3};
String str = Arrays.toString(arr); // 输出："[1, 2, 3]"</code>

<code class="java">int[] arr = {1, 2, 3};
StringJoiner joiner = new StringJoiner(", ");
for (int num : arr) {
    joiner.add(String.valueOf(num));
}
String str = joiner.toString(); // 输出："1, 2, 3"</code>

<code class="java">int[] arr = {1, 2, 3};
StringBuilder sb = new StringBuilder();
sb.append("[");
for (int i = 0; i < arr.length; i++) {
    sb.append(arr[i]);
    if (i < arr.length - 1) {
        sb.append(", ");
    }
}
sb.append("]");
String str = sb.toString(); // 输出："[1, 2, 3]"</code>

<code class="java">public static String arrayToString(int[] arr) {
    String str = "";
    for (int num : arr) {
        str += num + ", ";
    }
    return str.substring(0, str.length() - 2);
}

int[] arr = {1, 2, 3};
String str = arrayToString(arr); // 输出："1, 2, 3"</code>