Utils in Java
1.java.lang.System https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html 2.org.apache.commons.lang.SystemUtils uses it. . getJavaHome().getJavaIoTmpDir().getUserDir().getUserHome() .JAVA_VERSION.OS_NAME.USER_TIMEZONE 3.org.apache.commons.lang.math.NumberUtils http://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/math/NumberUtils.html 4.org.apache.commons.lang.StringUtils https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringUtils.html 5.org.springframework.beans.BeanUtils https://docs.spring.io/spring-framework/docs/5.1.3.RELEASE/javadoc-api/org/springframework/beans/BeanUtils.html 6.org.apache.commons.beanutils http://commons.apache.org/proper/commons-beanutils/javadocs/v1.9.3/apidocs/index.html http://commons.apache.org/proper/commons-beanutils/