class Main {
  public static void main(String[] args) {
    String str1 = "Java";
    String str2 = "Programming";

    // concatenate str1 and str2
    System.out.println(str1.concat(str2));

  }
}

// Output: JavaProgramming

Syntax of concat()

The syntax of the string concat() method is:

string.concat(String str)

Here, string is an object of the String class.

concat() Parameters

The concat() method takes a single parameter.

• str - string to be joined

concat() Return Value

• returns a string which is the concatenation of string and str (argument string)

Example: Java concat()

class Main {
  public static void main(String[] args) {
    String str1 = "Learn ";
    String str2 = "Java";

    // concatenate str1 and str2
    System.out.println(str1.concat(str2)); // "Learn Java"


    // concatenate str2 and str11
    System.out.println(str2.concat(str1)); // "JavaLearn "

  }
}

Using + Operator for Concatenation

In Java, you can also use the + operator to concatenate two strings. For example,

class Main {
  public static void main(String[] args) {
    String str1 = "Learn ";
    String str2 = "Java";

    // concatenate str1 and str2
    System.out.println(str1 + str2); // "Learn Java"


    // concatenate str2 and str11
    System.out.println(str2 + str1); // "JavaLearn "

  }
}

concat() Vs the + Operator for Concatenation