java中List＜String＞转字符串形式常用方法总结(非常全!)

List<String> list= Arrays.list("A", "B", "C");
String result = String.join(", ", list); // A, B, C

// 兼容性好（全版本Java）
List<String> list= Arrays.list("A", "B", "C");
StringBuilder sb = new StringBuilder();
for (String s : list) {
    if (sb.length() > 0) {
        sb.append(" | ");
    }
    sb.append(s);
}
String result = sb.toString(); // A | B | C

// 支持处理复杂转换
List<String> list= Arrays.list("A", "B", "C");
String result = list.stream()
        .map(String::toLowerCase) // 元素处理示例
        .collect(Collectors.joining(" - ")); // a - b - c

List<String> list= Arrays.list("A", "B", "C");

// 需引入依赖 <commons-lang3>
String result = StringUtils.join(list, " \ "); // A \ B \ C


// 需引入依赖 <Guava>
String result = Joiner.on(", ").skipNulls().join(list); // 自动跳null

// 添加前缀后缀
String jsonStyle = "[ " + String.join(", ", list) + " ]";
// 输出：[ A, B, C ]

// 动态生成带序号列表
StringBuilder sb = new StringBuilder();
for (int i = 0; i < sjzjList.size(); i++) {
    sb.append((i+1)+". "+sjzjList.get(i)+"\n");
}
// 输出：1. A\n2. B\n3. C

// 多级列表转换
List<List<String>> multiList = Arrays.asList(
    Arrays.asList("A1", "A2"),
    Arrays.asList("B1", "B2")
);

String nestedResult = multiList.stream()
    .map(subList -> "(" + String.join("/", subList) + ")")
    .collect(Collectors.joining(" → ")); 
// 输出：(A1/A2) → (B1/B2)

// 使用HTML转义（示例）
String htmlSafe = list.stream()
    .map(s -> StringEscapeUtils.escapeHtml4(s))  // commons-text
    .collect(Collectors.joining("<br/>"));

// 处理逗号场景
String csv = sjzjList.stream()
    .map(s -> "\"" + s.replace("\"", "\"\"") + "\"") // 双引号转义
    .collect(Collectors.joining(","));