Guava中字符串切割和拼接的强大API

public class Test {
    public static void main(String[] args) {
        
        String str = "a, ,b,c, ,d,e";
        List<String> list = Splitter.on(',')
                .trimResults()//去掉空格
                .omitEmptyStrings()//去掉空值
                .splitToList(str);
        System.out.println("Guava 去掉空格的分割方法：" + list);

        // 依次 join 多个字符串，去掉null值，不会去掉空字符串""
        Joiner joiner = Joiner.on(",").skipNulls();
        String strResult = joiner.join("a", null, "b","","c");
        System.out.println("依次 join 多个字符串:" + strResult);

        List<String> list2 = Lists.newArrayList("a", "b", null);
        System.out.println("自动删除 list 中空值:" + joiner.join(list2));

    }
}

打印结果：

Guava 去掉空格的分割方法：[a, b, c, d, e]
依次 join 多个字符串:a,b,,c
自动删除 list 中空值:a,b