How to convert string to int in Java?

#1

How does one convert a String to an int in Java?

I have a string which contains only numbers (1-4 numbers to be specific), and I want to return the number which it represents. (Actually I have it first as a StringBuffer if that helps somehow.)

For example, given the string “1234” the result should be the number 1234.

#2 
by using the Integer.ParseInt() we can convert the string value into integer value.

 

int foo = Integer.parseInt("1234");

 

See the Javadoc for more information.
#3

For example, here are two ways:

Integer x = Integer.valueOf(str);

// or

int y = Integer.parseInt(str);

There is a slight difference between these methods:

 

valueOf returns new instance of java.lang.Integer

parseInt returns primitive int.