Guava - String Interface

Guava introduces many advanced string utilities based on developers' experience in application development works. Following is the list of useful string based utilities −

Useful String Utilities

Example - Join Values while Skipping Null Values

GuavaTester.java

package com.tutorialspoint;

import java.util.Arrays;
import com.google.common.base.Joiner;

public class GuavaTester {
   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testJoiner();	
   }

   private void testJoiner() {
      System.out.println(Joiner.on(",")
         .skipNulls()
         .join(Arrays.asList(1,2,3,4,5,null,6)));
   }
}

Output

Run the GuavaTester and verify the output.

1,2,3,4,5,6

Example - Omit Empty String while Spliting Strings

GuavaTester.java

package com.tutorialspoint;

import com.google.common.base.Splitter;

public class GuavaTester {
   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testSplitter();
   }

   private void testSplitter() {
      Iterable<String> list = Splitter.on(',')
         .trimResults()
         .omitEmptyStrings()
         .split("the ,quick, ,brown, fox, ,jumps, over, the, lazy, little, dog, ,,,,,.");
      System.out.println(list);
   }
}

Verify the Result

Run the GuavaTester and verify the output −

[the, quick, brown, fox, jumps, over, the, lazy, little, dog, .]

Example - Converting From Lower Underscore Case to Lower Camel Case

GuavaTester.java

package com.tutorialspoint;

import com.google.common.base.CaseFormat;

public class GuavaTester {
   public static void main(String args[]) {
      GuavaTester tester = new GuavaTester();
      tester.testCaseFormat();
   }

   private void testCaseFormat() {
      System.out.println(CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, "test_data"));
   }
}

Output

Run the GuavaTester and verify the output −

testData