Int To String Java

Java Array To String

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)
 

References

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