Convert String to Int in Java: Exploring the Integer.parseInt() and Integer.valueOf() Methods

How can a String be converted to an int in Java?

What methods are available for converting a String to an int in Java?

Answer:

In Java, a String can be converted to an int using the Integer.parseInt() or Integer.valueOf() methods.

In Java, converting a String to an int is a common task that may arise when working with user input or data manipulation. The Integer.parseInt() and Integer.valueOf() methods provide a straightforward way to achieve this conversion.

The Integer.parseInt() method is used to convert a String to an int primitive data type. It takes a String as an argument and returns an int value. On the other hand, the Integer.valueOf() method returns an instance of Integer class, which wraps the int value.

When using Integer.parseInt(), the method interprets the String as a signed decimal integer. If the String does not represent a valid integer, a NumberFormatException will be thrown. It's important to handle this exception to prevent runtime errors in your program.

Here is an example of how to use the Integer.parseInt() and Integer.valueOf() methods:

Example:

String str = "123";
int num1 = Integer.parseInt(str);
Integer num2 = Integer.valueOf(str);

After executing this code, both num1 and num2 will hold the integer value of 123. You can then perform arithmetic operations or use the converted integer in your Java program as needed.

Remember to handle exceptions and validate the String input to ensure that it can be successfully converted to an int without causing errors in your program.