![]() ![]() ![]() Suppose str is not a proper number then this method Integer.parseInt() will also throw NumberFormatException. Let’s see an example of using Integer.valueOf() to convert String into int in java. This is an example of Factory method design pattern in Java and known as Integer.valueOf(), this is also a static method like main and can be used as utility for string to int conversion. This method return an Integer object holding the value represented by the string argument. Integer class provide another method to converting string to integer value. By Using Integer.valueOf(String value) method ![]() It is static method in the all wrapper classes like Float.parseFloat() and Double.parseDouble() to perform data type conversion. Other wrapper classes in java has same technique to be used to convert other data type like float and Double to String in Java. Suppose str is not a proper number then this method Integer.parseInt() will throw NumberFormatException. Let see an example of String to int conversion: //using Integer.parseInt It is extremely easy and most flexible way of converting String to Integer. This is recommended method to be used for string to int conversion. This is method in Integer class used to converting string value to int value. There are following different ways of converting String object into int or Integer in Java : By using Intger.parseInt(String value) method So it is not only for converting Integer to String and String to Integer, It conversion may be for Long, Date, Enum, Double to String ,but it is similar to converting String to Integer. So its most useful in web application to converting String to Integer and also because of its frequent need given that String and Integer are two most widely used type in all sort of program and you often gets data between any of these formats. Converting String to Integer and Integer to String is one of the basic tasks of java.There are many use cases where we need of this conversion like in web application any request parameter with query string is always in form string whatever it is int or long. Remember auto-boxing only converts primitive to Object it doesn’t convert one data type to other. But converting String to Integer and Integer to String is not an auto-boxing. As of Java 5, java provide automatic conversion to int to Integer and Integer to int, it also called Auto-boxing feature of java. In java Integer is a wrapper class of int. ![]()
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