Friday, 13 April 2018

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
    */

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