Apache Commons Lang 3.0 is a java library with lot of utilities and reusable components. This requires the library commons-lang3-3.0.1.jar to be in classpath. The following example shows negating a boolean value.
package com.bethecoder.tutorials.commons_lang.tests.booleans; import org.apache.commons.lang3.BooleanUtils; public class NegateTest { /** * @param args */ public static void main(String[] args) { System.out.println(BooleanUtils.negate(null)); System.out.println(BooleanUtils.negate(Boolean.FALSE)); System.out.println(BooleanUtils.negate(Boolean.TRUE)); } }
null true false
