判断不为空和不为空串的方法java

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
</dependency>

if( StringUtils.isNotBlank(str3) && StringUtils.isNotEmpty(str3)){
    System.out.println("****StringUtils");
}

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>27.0.1-jre</version>
</dependency>

String str3 ="";
if(!Strings.isNullOrEmpty(str3)){
    System.out.println("****");

}