Java中String转字符数组几种常见的方法

String str = "Hello, World!";
char[] charArray = str.toCharArray();
 
// 打印字符数组
for (char c : charArray) {
    System.out.print(c);
}

String str = "Hello, World!";
char[] charArray = new char[str.length()];
 
for (int i = 0; i < str.length(); i++) {
    charArray[i] = str.charAt(i);
}
 
// 打印字符数组
for (char c : charArray) {
    System.out.print(c);
}

String str = "Hello, World!";
byte[] byteArray = str.getBytes(StandardCharsets.UTF_8); // 使用UTF-8编码获取字节数组
char[] charArray = new char[byteArray.length];
 
for (int i = 0; i < byteArray.length; i++) {
    charArray[i] = (char) (byteArray[i] & 0xFF); // 将字节转换为字符（对于单字节字符）
}
 
// 打印字符数组（对于单字节字符）
for (char c : charArray) {
    System.out.print(c);
}

方法一：
String  str = Arrays.stream(issueIds).map(Objects::toString).collect(Collectors.joining(","));


方法二：
String s =  list.stream().map(Objects::toString).collect(Collectors.joining(","));


方法三：使用谷歌的Joiner转换
public static <T> String parseListToStr(List<T> list){
      String result = Joiner.on(",").join(list);
      return result;
}