Joining the strings in java 8

 Everyone will experience the scenario where we need to join the strings in java .

These are the few ways we can do String concatenation in java 8.

 Lets say we have 5 strings we want to make it 1 string with ',' separator .

   String finalval = String.join(",", "First", "Second", "Third", "Forth");

        

         output : First,Second,Third,Forth

 In Case of array of String then,

   String arry[] = { "Mango", "Apple", "Papaya" };

    String finalval = String.join("-", arry);  

        

         output : Mango-Apple-Papaya

    

Lets say we want to append string to create IN params for SQL Query then,

        import java.util.StringJoiner;

         StringJoiner sj = new StringJoiner("','", "('", "')");

          sj.setEmptyValue("It is empty");   

          System.out.println(sj.toString());  //prints 'It is empty'  as nothing is there to join  

          sj.add("nike").add("Reebok").add("Puma").add("LV").add("Gucci");

          System.out.println(sj.toString());

      output:('nike','Reebok','Puma','LV','Gucci')

            

    We can merge the two StringJoiners, 

           StringJoiner sj2 = new StringJoiner(",");

           sj2.add("Fossil");

          sj.merge(sj2);

          System.out.println(sj.toString());

output:('nike','Reebok','Puma','LV','Gucci','Fossil')

Read More