StringUtils

jar包 

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.4</version></dependency>

1.join方法

StringUtils.join(Object array[],String separator)   


将数组以符号或其他字符串为间隔组成新的字符串


Object array[] 需要转换的数组。separator组成新串的间隔符号，如 "," "|"


1 private static final String[] str = {"1","2","3","4"};
2 String str2 = StringUtils.join(str, "|");
3 
4 System.out.println(str2);
输出结果：1|2|3|4