Java将集合List转换成String字符串(或String转换成List)详解

List<String> list = new ArrayList<>();
list.add("A");
list.add("B");
list.add("C");
String joinedString = String.join(", ", list);
System.out.println(joinedString);  // 输出: A, B, C

List<String> list = new ArrayList<>();
list.add("A");
list.add("B");
list.add("C");
StringBuilder sb = new StringBuilder();
for (String str : list) {
    sb.append(str);
    sb.append(", ");
}
sb.setLength(sb.length() - 2);  // 删除最后一个逗号和空格
String joinedString = sb.toString();
System.out.println(joinedString);  // 输出: A, B, C

List<String> list = new ArrayList<>();
list.add("A");
list.add("B");
list.add("C");
String joinedString = list.stream().collect(Collectors.joining(", "));
System.out.println(joinedString);  // 输出: A, B, C

String str = "A, B, C";
List<String> list = Arrays.asList(str.split("\\s*,\\s*"));
System.out.println(list);  // 输出: [A, B, C]

String str = "A, B, C";
List<String> list = Pattern.compile("\\s*,\\s*").splitAsStream(str).collect(Collectors.toList());
System.out.println(list);  // 输出: [A, B, C]

List list = new ArrayList();
list.add("a");
list.add("b");
list.add("c");
list.add("d");

String str = list.stream().collect(Collectors.joining(","));

System.out.println(str); //输出结果为 a,b,c,d

String str = ",".concat(list.stream().collect(Collectors.joining(","))).concat(",");
System.out.println(str); //输出结果为 ,a,b,c,d,