AVAJAVA Web Tutorials

The StringUtils class of the Commons LangS library has several join() methods that can be used to combine an array or collection of strings into a single string. The JoinTest class demonstrates this first for an array of strings. After displaying join() results for the array, it converts this array of strings to a list of strings and then displays join() results for this list.

JoinTest.java

package test;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang.StringUtils;

public class JoinTest {

	public static void main(String[] args) throws IOException {

		String[] strArray = { "string1", "string2", "string3" };
		System.out.println("Joining array of strings");
		System.out.println(StringUtils.join(strArray));
		System.out.println(StringUtils.join(strArray, " "));

		System.out.println("\nJoining list of strings");
		List<String> strList = Arrays.asList(strArray);
		System.out.println(StringUtils.join(strList, null));
		System.out.println(StringUtils.join(strList, " "));
	}

}

The output of JoinTest is displayed here:

Results

Joining array of strings
string1string2string3
string1 string2 string3

Joining list of strings
string1string2string3
string1 string2 string3