在Java中如何捕获IndexOutOfBoundsException安全访问集合_集合索引异常技巧

List<String> list = Arrays.asList("a", "b", "c");
int index = 5;
if (index >= 0 && index < list.size()) {
    String value = list.get(index);
    System.out.println(value);
} else {
    System.out.println("索引超出范围：" + index);
}

public static <T> Optional<T> safeGet(List<T> list, int index) {
    if (list == null || index < 0 || index >= list.size()) {
        return Optional.empty();
    }
    return Optional.ofNullable(list.get(index));
}

Optional<String> result = safeGet(myList, 10);
result.ifPresentOrElse(
    System.out::println,
    () -> System.out.println("索引无效或元素为空")
);
</font>

<H3>3. 捕获异常作为兜底策略（不推荐常用）</H3>
<p>虽然可以用 try-catch 捕获 IndexOutOfBoundsException，但<strong>不应依赖异常控制流程</strong>，仅用于无法预判索引的特殊场景：</p>
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<font face="Courier New">
<pre class="brush:php;toolbar:false;">
try {
    String value = list.get(100);
    System.out.println(value);
} catch (IndexOutOfBoundsException e) {
    System.err.println("索引越界，使用默认值");
    value = "default";
}

if (list != null && !list.isEmpty() && index < list.size()) {
    return list.get(index);
}

if (Objects.nonNull(list) && index >= 0 && index < list.size()) { ... }