STRING CONCATENATION IN JAVA

Concatenate means combining multiple strings and form it as a single string. There are basically two ways to concatenate strings in java. They are –

1. + operator – It would act as an arithmetic operator only if both the operands supplied are arithmetic values. But the same operator would act as a concatenation operator, if atleast one operand supplied to the ‘+’ is a string class object.

Example –

public class String1 {

          public static void main(String[] args) {

                   String s1="10";

                   String s2="20";

                   String s3="hello";

                   System.out.println(s1+s2);

                   System.out.println(10+20);

                   System.out.println(s1+s3);

                   System.out.println("hello"+20);            

          }

}

Output –

1020

30

10hello

hello20

2. concat() method – This method is used to concat the given string on the RHS.

Example –

public class String1 {

          public static void main(String[] args) {

                   String s1="10";

                   String s2="20";

                   System.out.println(s1.concat(s2));                           

          }

}

Output –

1020