java String trim ltrim rtrim

Java strip whitespace from the beginning or the end of a string.

trim

remove all white spaces at beginning and end of string java

String str = "   hello lautturi java world   ";
str = str.trim();

ltrim

strip whitespace from the beginning of a string

public class Lautturi {
	static String ltrim(String str) {
		return (str == null)? null:str.replaceAll("^\\s+","");
	}

	public static void main(String[] args) {

		String str = "   hello lautturi java world   ";
		
		System.out.println(str);
		str = ltrim(str);
		System.out.println(str);
	}
}

rtrim

strip whitespace from the end of a string

public class Lautturi {
	static String rtrim(String str) {
		return (str == null)? null:str.replaceAll("\\s+$","");
	}

	public static void main(String[] args) {

		String str = "   hello lautturi java world   ";
		
		System.out.println(str);
		str = rtrim(str);
		System.out.println(str);
	}
}