在字符串列表中给出错误索引的代码

try {
    List<String> strings = new ArrayList<>();
    strings.add("Hello");
    strings.add("World");
    strings.add("!");

    // 错误索引
    int errorIndex = 3;

    String errorString = strings.get(errorIndex);
    System.out.println("错误字符串：" + errorString);
} catch (IndexOutOfBoundsException e) {
    System.out.println("错误索引：" + e.getMessage());
}

List<String> strings = new ArrayList<>();
strings.add("Hello");
strings.add("World");
strings.add("!");

// 错误索引
int errorIndex = 3;

if (errorIndex >= 0 && errorIndex < strings.size()) {
    String errorString = strings.get(errorIndex);
    System.out.println("错误字符串：" + errorString);
} else {
    System.out.println("错误索引");
}

List<String> strings = new ArrayList<>();
strings.add("Hello");
strings.add("World");
strings.add("!");

// 错误索引
int errorIndex = 3;

Optional<String> errorStringOpt = Optional.ofNullable(strings.size() > errorIndex ? strings.get(errorIndex) : null);
if (errorStringOpt.isPresent()) {
    String errorString = errorStringOpt.get();
    System.out.println("错误字符串：" + errorString);
} else {
    System.out.println("错误索引");
}