String Concatenation in java using StringBuilder

Following program will return the string by concatenating given strings along with concatenation character or string.

Implementation:

package com.lenin;

public final class StringConcator {

      private static String EMPTY = "";

     

      private StringConcator(){}

      public static String concat(char concat, String... values) {

            boolean space = false;

            StringBuilder sb = new StringBuilder();

            for (String value : values) {

                  if (value != null && !EMPTY.equals(value)) {

                        if (space) {

                              sb.append(concat);

                        }

                        sb.append(value);

                        space = true;

                  }

            }

            return sb.toString();

      }

      public static String concat(String concat, String... values) {

            boolean space = false;

            StringBuilder sb = new StringBuilder();

            for (String value : values) {

                  if (value != null && !EMPTY.equals(value)) {

                        if (space) {

                              sb.append(concat);

                        }

                        sb.append(value);

                        space = true;

                  }

            }

            return sb.toString();

      }

}

Test:

import static com.lenin.StringConcator.concat;

public class StringConcatTest {

      public static void main(String[] args) {

            System.out.println(concat(' ', "Leninkumar", "Koppoju"));

            System.out.println(concat(", ", "Spring", "Summer", "Autumn", "Winter"));

      }

}

Output:

Leninkumar Koppoju

Spring, Summer, Autumn, Winter