<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
</dependencies>
import org.apache.commons.lang3.StringUtils;
public class Main {
public static void main(String[] args) {
String str = "Hello, World!";
System.out.println(StringUtils.isEmpty(str));
System.out.println(StringUtils.substring(str, 0, 5));
System.out.println(StringUtils.join("Hello", "World"));
}
}
import org.apache.commons.lang3.ArrayUtils;
public class Main {
public static void main(String[] args) {
int[] array1 = {1, 2, 3};
int[] array2 = {4, 5, 6};
int[] newArray = ArrayUtils.addAll(array1, array2);
System.out.println(ArrayUtils.contains(newArray, 5));
int[] copiedArray = ArrayUtils.clone(newArray);
System.out.println(Arrays.toString(copiedArray));
}
}
log4j.rootLogger=INFO, Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
