• Java

How To Use PARSEINT Java: Everything You Need To Know

  • June 14, 2023
  • Muhammad Ahmad
  • POSTED ON June 14, 2023
  • POSTED BY Muhammad Ahmad

If you are a Java programmer, or even just a beginner looking to learn more about the language, you have probably come across the term “PARSEInt.” But what does this mean exactly, and how can it be used? In the following article you will learn the basics and ins-and-outs of PARSEInt Java programming. There are

If you are a Java programmer, or even just a beginner looking to learn more about the language, you have probably come across the term “PARSEInt.” But what does this mean exactly, and how can it be used? In the following article you will learn the basics and ins-and-outs of PARSEInt Java programming. There are also some things you should keep in mind when using the PARSEInt while coding. 

Basically, PARSE int Java programming is a method that converts a string to an integer. So, when you are using the method you have to use two arguments. One argument is to convert, i.e. radix, or base. The radix can be any integer from 2 to 36.

For example, the following code converts the string “123” to the integer 123:

int number = Integer.PARSEInt(“123”, 10);

The following code converts the string “0x123” to the integer 189:

int number = Integer.PARSEInt(“0x123”, 16);

When using Java PARSEInt, it is important to keep in mind the following tips:

  • The string must be a valid representation of an integer. For example, the string “123a” is not a valid representation of an integer, so PARSEInt will throw an exception if you try to convert it.
  • The radix must be a valid integer from 2 to 36. If you specify an invalid radix, PARSEInt will throw an exception.
  • If the string does not contain a valid integer, PARSEInt will return 0.

What does PARSE mean in programming or Java?

To PARSE something in computer science means separating a string into small components which can be easily processed. The broken strings or components are checked for syntax and a tag is attached to each. Do you know how to use parseInt in Java?

What does PARSEInt do in Java?

PARSEInt method is also a library in Java which makes the coding simple and easy to parse that is also getting input, validate it, and give the results needed. PARSEInt Java method is lightweight and made so that it is super simple to use. The reason behind its lightweightness is it is not dependent on other libraries. The advantage is that PARSEInt library can be used with any Java program that you want to build and even web apps. 

With PARSEInt converting strings and checking the input that is provided by users is very easy. On top of that, converting that input is also easy and simple. It’s lightweight, has no dependencies, and works in any Java application. It has two main functions: parsing and validation. Parsing converts input (like a string) into a usable format (like an integer). Validation checks if the input meets specific rules. PARSEInt can handle various input types, like numbers, dates, URLs, and email addresses. For instance, you can use it to validate an email address before sending an email. The library provides simple methods, PARSE() and validate(), which you can use in your Java code without creating additional objects.

PARSEint java

Using PARSEInt in Java

The syntax to call a PARSEInt method is simply to pass a string, specifically which is a representation of a Java integer, as an argument:

Static int PARSEInt

For some cases developers might have to PARSE, i.e. break a string into smaller representation which is an integer that can be a different base number which can be binary, octal, or hexadecimal base numbers. For performing this parsing operation, developers pass an additional argument to the PARSEInt function where they have to specify radix i.e. the base for number. Following is the syntax:

static int PARSEInt(String s, int radix)

To the PARSEInt() method you have to pass a string which contains numbers. For non number input the method will throw an exception and conversion won’t happen.

Benefits of PARSEInt

There are many benefits of using the Java PARSEInt() method or library, however the usage depends on your needs. However, to keep you in the game, following are the benefits that you will get for using this method instead of other or custom methods. 


PARSEInt is a straightforward function that simplifies the process of converting a string into an integer. By using PARSEInt, manual string parsing is no longer necessary, making the conversion easier and more efficient.


PARSEInt handles various complexities associated with string-to-integer conversions. It manages different number bases, prevents overflow, and detects invalid characters. This enhances the reliability of your code and reduces the likelihood of errors.


PARSEInt employs a standardized approach to convert strings to integers. This uniformity ensures consistent results across different Java programs and platforms. It promotes code portability and facilitates easier maintenance.

Exception Handling

In case the input string provided to PARSEInt is not a valid integer representation, it throws a “NumberFormatException.” This feature simplifies error detection and handling in your code. You can utilize try-catch blocks or validate the input beforehand to handle such exceptions appropriately.

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Instructions for Using PARSEInt

Following are some important things or more like instructions that you should keep in mind when using the method. 

Import the java.lang package.

The first, and most important, of course you have to import the method into your program. Which is a fairly easy task and can be done in simple one line commands. Following is the command for importing. 

import java.lang.*;

Convert a string to an integer

If you want to convert a string into an integer, which is what the method is for. First you have to call the method from the integer calls to convert string to int Java programming, which you want to convert. Then the method will run and return you the desired results, provided everything went well. Here is a sample example. 

String str = “123”;
int number = Integer.PARSEInt(str);
System.out.println(“The integer value is: ” + number);

Get output

The above-mentioned, integer.parseInt Java example is passing ‘123’ as a string and not a number into the method, which is being called in the second line from its integer class. The method runs and converts the string ‘123’ into numbers which is stored into the number variable, which is declared in the second line. The system then prints the result with a message. And result are as follows: 

“The integer value is: 123.”

Important note!

When using the PARSEInt Java programming method there are few important notes that you should keep in mind when implementing the method. 

  • The most important thing is, if a string, which can be anything, cannot be converted into a valid integer, the PARSEInt method will throw an error back to you.
  • Then, when you are converting whitespaces have to be taken into account, both leading and trailing, which are ignored. So, the string returned is free of whitespaces.
  • To parse in different base numbers you have to specify. Like if the string is starting with 0x or -0x, then the results will be in hexadecimal.


Muhammad Ahmad

Currently serving as the SEO Manager at vteams, Ahmed is a highly skilled individual with several years of experience of Digital Marketing.


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