Split a String in Java - 5 different ways
In this section, we will show you five different ways to split a String in Java based on the delimiter.
1. Using String.split()
The split method in Java splits a string into substrings using a delimiter that is specified using a regular expression.
1. This method returns an array of strings.
2. This method takes a regex string as a parameter.
Split a whitespace separated String
//Split by a whitespace
String input = "yellow black green orange";
String[] colors = input.split(" ");
Split a comma separated String
//Split by a comma
String input = "yellow,black,green,orange";
String[] colors = input.split(",");
Split a dot separated String
//Split by a dot
String input = "123.12.12.1";
String[] splitted = input.split("\\.");
Split and Trim a comma separated String
String input = " yellow,black ,green, orange";
String[] colors = input.trim().split("\\s*,\\s*");
trim() method removes all the leading and trailing spaces in the string and returns a String. split("\\s*,\\s*") handles the extra spaces around delimiter.
2. Using Java 8 Stream
String input = " yellow,black ,green, orange";
String[] colors = Arrays.stream(input.split(","))
.map(String::trim)
.toArray(String[]::new);
Arrays.stream() method returns a Sequential Stream from the array passed as the parameter. Here we are passing input.split(",") as parameter, which is an String array. The split method in Java splits a string into substrings using a comma that is specified using a regular expression. trim() method removes all the leading and trailing spaces in the string and returns a String. Finally, we are converting a Stream to an array using Stream toArray() method.
3. Using StringTokenizer
String input = "yellow, black,green,orange";
StringTokenizer strings = new StringTokenizer(input, ",");
while(strings.hasMoreTokens()){
String substring = strings.nextToken().trim();
System.out.println(substring);
}
The StringTokenizer class of the java.util package is designed to decompose a string into its components. It Splits a string into parts using the string comma as a delimiter. nextToken() returns the next substring
4. Using Google Guava Splitter
String input = "yellow, black,green,orange";
List<String> splitted = Splitter.on(',')
.trimResults()
.splitToList(input);
on() method returns a splitter that uses the given single-character separator. trimResults() removes leading and trailing whitespace from each returned substring. splitToList() splits sequence into string and returns them as an immutable list.
5. Using Apache Commons StringUtils
First add Apache Commons to your project: https://mvnrepository.com/artifact/org.apache.commons/commons-lang3
String input = "yellow,black,green,orange";
String[] splitted = StringUtils.split(input, ',');
split(String str, char separator) method splits the input String into an array, we need to specify the separator.
Complete Example:
import com.google.common.base.Splitter;
import org.apache.commons.lang3.StringUtils;
import java.util.Arrays;
import java.util.List;
import java.util.StringTokenizer;
public class Main {
public static void main(String[] args) {
//Example 1 - split by a whitespace
String input1 = "yellow black green orange";
String[] colors1 = input1.split(" ");
//Example 2 - split by a comma
String input2 = "yellow,black,green,orange";
String[] colors2 = input2.split(",");
//Example 3 - split by a dot
String input3 = "123.12.12.1";
String[] splitted1 = input3.split("\\.");
//Split and Trim a comma separated String
String input4 = " yellow,black ,green, orange";
String[] colors4 = input4.trim().split("\\s*,\\s*");
//Using Java 8 Stream
String input5 = " yellow,black ,green, orange";
String[] colors5 = Arrays.stream(input5.split(","))
.map(String::trim)
.toArray(String[]::new);
//Split a comma separated String using StringTokenizer
String input6 = "yellow, black,green,orange";
StringTokenizer strings = new StringTokenizer(input6, ",");
while(strings.hasMoreTokens()){
String substring = strings.nextToken().trim();
}
//Using Google Guava Splitter
String input7 = "yellow, black,green,orange";
List<String> splitted2 = Splitter.on(',')
.trimResults()
.splitToList(input7);
//Using Apache Commons StringUtils
String input = "yellow,black,green,orange";
String[] splitted3 = StringUtils.split(input, ',');
}
}
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