Concatenating two strings in Java

public class StringConcate {

    public static void main(String[] args) {
        String s1 = "Welcome to";
        String s2 = " Java";
        String s3 = s1 + s2;
        System.out.println(s3);
        String s4 = s1.concat(s2);
        System.out.println(s4);
    }
}

public class StringConcate {

public static void main(String[] args) {

String s1 = "Welcome to";

String s2 = " Java";

String s3 = s1 + s2;

System.out.println(s3);

String s4 = s1.concat(s2);

System.out.println(s4);

}

The + operator can be used for concatenation of strings.
concat(String str) is a method of String class that concatenate two strings and return a String.