String Concatenation

In java, string concatenation forms a new string that is the combination of multiple strings. There are two ways to concat string in java:

1. By + (string concatenation) operator
2. By concat() method

 1) String Concatenation by + (string concatenation) operator:

Java string concatenation operator (+) is used to add strings.

For Example:

Class StringConcatenation1{
 public static void main(String args[]){
 
   String s="Sachin"+" Tendulkar";
   System.out.println(s);//Sachin Tendulkar
 }
}

String concatenation is implemented through the StringBuilder (or StringBuffer) class and its append method. String concatenation operator produces a new string by appending the second operand onto the end of the first operand. The string concatenation operator can concat not only string but primitive values also.

For Example:

Class StringConcatenation2{
 public static void main(String args[]){
 
   String s=50+30+"Sachin"+40+40;
   System.out.println(s);//80Sachin4040
 }
}

2) String Concatenation by concat() method

The String concat() method concatenates the specified string to the end of current string.

Syntax:

public String concat(String another)  

Let's see the example of String concat() method.

Class StringConcatenation3{
 public static void main(String args[]){
 
   String s1="Sachin ";
   String s2="Tendulkar";
    s3=s1.concat(s2);
  System.out.println(s3);//Sachin Tendulkar
  }
}