LeftTrimString.java

package com.levelup.java.string;

import static org.junit.Assert.assertEquals;

import org.apache.commons.lang3.StringUtils;
import org.junit.Test;

import com.google.common.base.CharMatcher;

/**
 * This java example will demonstrate trimming all leading spaces in java.
 * 
 * @author Justin Musgrove
 * @see <a
 *      href='http://www.leveluplunch.com/java/examples/left-trim-string/'>Left
 *      trim string</a>
 * 
 */
public class LeftTrimString {
	
	@Test
	public void trim_leading_spaces_from_string_guava() {

		String leftTrimmedString = CharMatcher.WHITESPACE
				.trimLeadingFrom("       Refugee       ");

		assertEquals("Refugee       ", leftTrimmedString);
	}

	@Test
	public void trim_leading_spaces_from_string_apache_commons() {

		String leftTrimmedString = StringUtils.stripStart(
				"           The Waiting          ", " ");

		assertEquals("The Waiting          ", leftTrimmedString);
	}

	@Test
	public void trim_leading_spaces_from_string_spring_with_trimLeadingWhiteSpace() {

		String leftTrimmedString = org.springframework.util.StringUtils
				.trimLeadingWhitespace("      Free Falling          ");

		assertEquals("Free Falling          ", leftTrimmedString);
	}

	@Test
	public void trim_leading_spaces_from_string_spring_with_trim_leading_character() {

		String leftTrimmedString = org.springframework.util.StringUtils
				.trimLeadingCharacter("      I won't back dowm          ", ' ');
		assertEquals("I won't back dowm          ", leftTrimmedString);
	}
}