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 How to perform string-concatenation

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String concatenation:

  • It is an operation of joining the character strings back-to-back.
  • In this example, we will see how to concatenate Strings in Java.
  • The String concatenation in Java can be done in numerous ways.
  • Using + operator - while use + operator string_1 + string_2 statement, then it will executed as, new StringBuffer().append(string_1 ).append(string_2) within it.
  • + operator is not recommended for huge number of String concatenation as the performance is not good.
  • Using String.concat() method – concatenates the specified string to the end of this string.
  • Using StringBuffer.append method - Appends the specified StringBuffer to this sequence.

sample code:

public class kasshiv_infotech
{
    public static void main(String args[])
    {
        String string_1 = "Kaashiv";
        String string_2 = "Infotech";
        String string_3 = string_1 + string_2;
        System.out.println("+ operator : " + string_3);
        String string_4 = string_1.concat(string_2);
        System.out.println("String concat method : " + string_4);
        String string_5 = new StringBuffer().append(string_1).append(string_2).toString();
        System.out.println("StringBuffer append method : " + string_5);
    }
 
}

Output:

+ operator : KaashivInfotech
String concat method : KaashivInfotech
StringBuffer append method : KaashivInfotech

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