Java – Convert String to int

In Java, you can use Integer.parseInt() to convert a String to int.
1. Integer.parseInt() Examples

Example to convert a String “10” to an primitive int.

String number = "10";
int result = Integer.parseInt(number);
System.out.println(result);

Output

10

2. Integer.valueOf() Examples

Alternatively, you can use Integer.valueOf(), it will returns an Integer object.

String number = "10";
Integer result = Integer.valueOf(number);
System.out.println(result);

Output

10

Note
In summary, parseInt(String) returns a primitive int, whereas valueOf(String) returns a new Integer() object.

3. NumberFormatException

If the string does not contain a parsable integer, a NumberFormatException will be thrown.

String number = "10A";
int result = Integer.parseInt(number);
System.out.println(result);

Output

Exception in thread "main" java.lang.NumberFormatException: For input string: "10A"
 at java.lang.NumberFormatException.forInputString(Unknown Source)
 at java.lang.Integer.parseInt(Unknown Source)
 at java.lang.Integer.valueOf(Unknown Source)

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About Mariano

I'm Ethan Mariano a software engineer by profession and reader/writter by passion.I have good understanding and knowledge of AngularJS, Database, javascript, web development, digital marketing and exploring other technologies related to Software development.