String Concat Example

1. /*
           Java String Concat Example.
           This Java String concat example shows how to concat String in Java.
    */
   public class JavaStringConcat {
           public static void main(String args[]){
                   /*
                    * String concatenation can be done in several ways in Java.
                    */
   
   
                   String str1 = “Hello”;
                   String str2 = ” World”;
   
   
                   //1. Using + operator
                   String str3 = str1 + str2;
                   System.out.println(“String concat using + operator : “ + str3);
   
   
                   /*
                    * Internally str1 + str 2 statement would be executed as,
                    * new StringBuffer().append(str1).append(str2)
                    *
                    * String concatenation using + operator is not recommended for large number
                    * of concatenation as the performance is not good.
                    */
                  
                   //2. Using String.concat() method
                   String str4 = str1.concat(str2);
                   System.out.println(“String concat using String concat method : “ + str4);
   
   
                   //3. Using StringBuffer.append method
                   String str5 = new StringBuffer().append(str1).append(str2).toString();
                   System.out.println(“String concat using StringBuffer append method : “ + str5);
           }
   
   
   }
   
   
   /*
   Output of Java String concat example would be
   String concat using + operator : Hello World
   String concat using String concat method : Hello World
   String concat using StringBuffer append method : Hello World
   */