In the case of concat method as no new object is created if result string is of zero length hence it consumes lesser memory as compared to + operator. + operator on the other hand do not throw any exception in a case called with null. + operator always create new object as output no matter what length of result string produced after appending.Ĭoncat method returns null pointer exception in case this method called with null as input. The concat method would create new string object as output after appending only if output string has length greater than zero otherwise return the same target string as an output object. + operator could take any type of input and convert it to a string before append to the target string. The concat method could only take string as input and would ask for compile time error if any other type of input has been provided to it. A String is an object that holds the sequence of characters. Since strings are immutable in Java, we cannot change the string value once it has initialized. + operator could append any number of strings and it not bouded to only input as a parameter. The Java String concat() method is used to concatenate the specified string to the end of this string.Concatenation is the process of combining two or more strings to form a new string. The concat method could take the only argument as input and append this input to the target string on which this method is called. While on the other hand + is an operator and not a method. No.Īs syntax refers concat() is a method and comes under package.

The following are the important differences between concat method and + operator. The important thing to note here is that every time you add a String. we can also use String literal or String variable it will work in both the cases. Visual presentation of Java String concat() Method. Both are developed for the same functionality but still have some major differences. This example will create a new String as: hello edureka You can add any number of string using this operator which will create a whole new String. Otherwise, a String object is returned that represents a character sequence that is the concatenation of the character sequence represented by this String object and the character sequence represented by the argument string. These two methods are namely Concat() method and + operator. Share Follow edited at 18:40 bragboy 35k 30 114 171 answered at 17:31 Peter Lang 54. Java provides two ways in order to append strings and make them one. 23 Answers Sorted by: 99 You can concatenate Strings using the + operator: ('Your number is ' + theNumber + '') theNumber is implicitly converted to the String '42'.

Java string concat