526互联

Java 1.8 list特性用法

发布时间 2023-10-12 17:03:25作者: lewisat

list转换成具体的字符串拼接

@Test
public void ListToString() {
    // 构造list
    List<String> list = Arrays.asList("张三", "李四", "王五", "赵六");
    // 以逗号分隔，带前缀后缀
    String str1 = list.stream().collect(Collectors.joining(",", "{", "}"));
    System.out.println("Collectors.joining 带前缀后缀 : " + str1);
    // 以@分隔，不带前缀后缀
    String str2 = list.stream().collect(Collectors.joining("@"));
    System.out.println("Collectors.joining 不带前缀后缀 : " + str2);
}
// 输出
Collectors.joining 带前缀后缀 : {张三,李四,王五,赵六}
Collectors.joining 不带前缀后缀 : 张三@李四@王五@赵六

带前缀的方式可以拼接成这样的哦

   public static void main(String[] args) {
        List<String> list = Arrays.asList("airTemp","airWet","airLight","airAtmos","windDirectWord","windSpeed","rainFall","airCarbon");
        String str1 = list.stream().collect(Collectors.joining("','", "'", "'"));
        System.out.println(str1);
    }