Java String concat() Method

June 7, 2023

What is String?

In Java, an string class is a series of characters that are interpreted literally by a script. An object called a string represents a string of characters. Java.lang is used. A string object is made using the String class.

Numerous methods, including compare(), concat(), equals(), split(), length(), replace(), compareTo(), intern(), and substring(), are available in the Java String class.

To know more about String Class in java read the complete article.

String concat() Method:

The Java String class concat() method combines strings and returns a combined string. Multiple strings are concatenated using the Java string concat() function. The combined string is returned after the requested string is appended to the end of the original string using this function. To merge multiple strings together, we can utilise the concat() technique.

The java.lang.String class provides a lot of built-in methods that are used to manipulate string in Java.These methods help us to perform operations on String objects such as trimming, concatenating, converting, comparing, replacing strings etc.

Returns A string that represents the concatenation of this object's characters followed by the string argument's characters.

Note: The CONCAT() function concatenates two strings only. If you want to concatenate more than two strings, you need to apply the CONCAT() function multiple times.

String compareto()

String comparetoignorecase()

String contains()

String contentequals()

String endswith()

Syntax:

public String concat(String str)

Parameters:

str - the String that is concatenated to the end of this String.

Let’s look at a string-related Java program where the Java String concat() method is used to perform an operation on the given string.

Examples : Concatenating two given strings difference

Run

public class Main {
  public static void main(String[] args) {
    String firstName = "PrepInsta";
    String lastName = "Prime";
    System.out.println(firstName.concat(lastName));
  }
}

Output

PrepInstaPrime

Explanation: Here the output comes is PrepInstaPrime because string1 is concatenated with String2 which form new statement.

Examples 2 : Java String Concat() Method

Run

public class Main {
   public static void main(String args[]) {
       //One way of doing concatenation
       String str1 = "Welcome";
       str1 = str1.concat(" to ");
       str1 = str1.concat(" PrepInsta ");
       System.out.println(str1);       
   }
}

Output

Welcome to  PrepInsta

Explanation: Here the output comes is Welcome to PrepInsta because string1 is concatenated with String2 which form new object.

Examples 3: Concatenating two given strings ignoring lower and upper case.

Run

public class Main {  
    public static void main(String[] args) {      
        String str1 = "Hey Everyone, ";  
        String str2 = "Welcome to PrepInsta";  
        String str3 = " Prime";  
        String str4 = str1.concat(str2);          
        System.out.println(str4);  
        String str5 = str1.concat(str2).concat(str3);  
        System.out.println(str5);  
    }  
}

Output

Hey Everyone, Welcome to PrepInsta
Hey Everyone, Welcome to PrepInsta Prime

Explanation: Here the output shows concatenating multiple string objects together where we can see String1 and String2 is concatenated and then Multiple String is concatenated to form new output.

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Java String concat() Method

What is String?

String concat() Method:

Syntax:

Parameters:

Let’s look at a string-related Java program where the Java String concat() method is used to perform an operation on the given string.

Examples : Concatenating two given strings difference

Output

Examples 2 : Java String Concat() Method

Output

Examples 3: Concatenating two given strings ignoring lower and upper case.

Output

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