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Java convert int to String example

This example shows how to convert int to string in Java using toString, valueOf, and + operator. It also shows the best way to convert int to string.

How to convert int to String in Java?

1) Convert int to String using String class

Use the valueOf static method of the String class to convert.

The valueOf method returns a string representation of int argument.

Output

2) Using the Integer wrapper class

Use the toString method of the Integer wrapper class to convert.

This method returns a string representation of an int value passed as a parameter.

Output

3) Using String concatenation

String concatenation can be indirectly used to convert any Java primitive value to a string as given below.

Output

What is the best way to convert int to String?

The valueOf method of the String class internally calls the toString method of the Integer wrapper class to convert from int to a string value. Using either of the methods is equally efficient in terms of performance. The preferred way is to use the toString method of the Integer wrapper class.

String concatenation should be avoided mainly for the conversion purpose because,

a) It is difficult to visually understand that the intent of the code statement is conversion.

b) String concatenation operation creates unnecessary temporary objects during the conversion process. String concatenation is achieved using the append method of the StringBuilder or StringBuffer class. So the code,

Will run like,

This example is a part of the Java Basic Examples and Java Type conversion Tutorial.

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