java.lang.String class comes with concat() String method to concatenate two strings.
The signature is given as defined in String class.
- public String concat(String str): Returns a new string, the result of concatenation of two strings.
Following example concat() String illustrates the usage concat() method.
public class StringMethodDemo
{
public static void main(String args[])
{
String str1 = "Hello";
String str2 = "World";
String str3 = str1.concat(str2);
System.out.println("Concatenation of " + str1 + " and " + str2 + " is " + str3);
System.out.println("Concatenation of Raja and Rani is " + "Raja".concat("Rani"));
System.out.println("\nUsing + operator: " + "Raja"+"Rani");
}
}

Output screenshot on concat() String Example
By performance concat() is nearly 40 times faster than using + operator.
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