Java add separator to string 2017-04-18 23:21
Let's say you have a list of string and you want to add separator to them. If you use JDK8+ you can use String.join(). For JDK7-, I recommend you to use StringUtils in apache-commons-lang. The code is like following.
For JDK8+
String joinStr1 = String.join(",", "a", "b", "c");
System.out.println(joinStr1);
String[] array = new String[] { "d", "e", "f" };
String joinStr2 = String.join(",", array);
System.out.println(joinStr2);
List<String> list = Arrays.asList(array);
String joinStr3 = String.join(",", list);
System.out.println(joinStr3);
Use apache-commons-lang jar
Dependency in pom file
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
Code
List<String> testList = new ArrayList<>();
testList.add("a");
testList.add("b");
testList.add("c");
System.out.println(StringUtils.join(testList, ","));
EOF