How to Remove Multiple Spaces in a String in Java

Here we can obtain two ways to remove multiple spaces in a string in Java. The first way is to replace multiple spaces with the replaceAll() method in the string object.The second way is to wrap the string into a StringTokenizer object using the nextToken(” “) method.

Source Code

package com.beginner.examples;

public class RemoveExtraWhitespace1 {

	public static void main(String[] args) {

		//This is a string that needs to be processed
		String str = "I    love     java";
		
		//Use regular to replace multiple Spaces with one
		str = str.replaceAll(" +", " ");
		
		System.out.println(str);
		
	}

}

Output:

I love java

package com.beginner.examples;

import java.util.StringTokenizer;

public class RemoveExtraWhitespace2 {

	public static void main(String[] args) {
		
		//This is a string that needs to be processed
		String testStr = "This   is     a  string   that    needs  to   be   processed";
		
		//Encapsulate this string into a StringTokenizer object
		StringTokenizer st = new StringTokenizer(testStr);
		
		//Store separated strings
		StringBuilder sb = new StringBuilder();
		
		while(st.hasMoreElements()) {
			
			String word =st.nextToken(" ");
			
			sb.append(word).append(" ");
		}
		
		System.out.println(sb.toString());

	}

}

Output:

This is a string that needs to be processed

References

Imported packages in Java documentation:

StringTokenizer