• Java
    • JAXB Tutorial
      • What is JAXB
      • JAXB Marshalling Example
      • JAXB UnMarshalling Example
  • Spring Tutorial
    • Spring Core Tutorial
    • Spring MVC Tutorial
      • Quick Start
        • Flow Diagram
        • Hello World Example
        • Form Handling Example
      • Handler Mapping
        • BeanNameUrlHandlerMapping
        • ControllerClassNameHandlerMapping
        • SimpleUrlHandlerMapping
      • Validation & Exception Handling
        • Validation+Annotations
        • Validation+ResourceBundle
        • @ExceptionHandler
        • @ControllerAdvice
        • Custom Exception Handling
      • Form Tag Library
        • Textbox Example
        • TextArea Example
        • Password Example
        • Dropdown Box Example
        • Checkboxes Example
        • Radiobuttons Example
        • HiddenValue Example
      • Misc
        • Change Config file name
    • Spring Boot Tutorial
  • Hibernate Tutorial
  • REST Tutorial
    • JAX-RS REST @PathParam Example
    • JAX-RS REST @QueryParam Example
    • JAX-RS REST @DefaultValue Example
    • JAX-RS REST @Context Example
    • JAX-RS REST @MatrixParam Example
    • JAX-RS REST @FormParam Example
    • JAX-RS REST @Produces Example
    • JAX-RS REST @Consumes Example
    • JAX-RS REST @Produces both XML and JSON Example
    • JAX-RS REST @Consumes both XML and JSON Example
  • Miscellaneous
    • JSON Parser
      • Read a JSON file
      • Write JSON object to File
      • Read / Write JSON using GSON
      • Java Object to JSON using JAXB
    • CSV Parser
      • Read / Write CSV file
      • Read/Parse/Write CSV File – OpenCSV
      • Export data into a CSV File
      • CsvToBean and BeanToCsv – OpenCSV

JavaInterviewPoint

Java Development Tutorials

Difference between Integer.parseInt() vs Integer.valueOf() in Java

August 30, 2016 by javainterviewpoint Leave a Comment

Both the Integer.parseInt() and Integer.valueOf() method is used to convert a String into Integer in Java, both does the same work then why there is a need for two different method will be the question here. They both does the same job but has a slight difference among them. Lets look into the difference between parseInt vs valueOf in Java

Difference between parseInt vs valueOf in Java

The main difference between Integer.parseInt() vs Integer.valueOf() would be

  • parseInt() :  will be returning the primitive type int
  • valueOf() : will be returning the Integer wrapper Object

After the introduction of Autoboxing and Unboxing in Java in 1.5, it will not make much of a difference but worth knowing.

The parseXXX() method and valueOf() is almost present in most of the numeric primitive datatypes wrapper class, such as Integer, Long, Double, Float, etc.

When we look into the source code of parseInt() and valueOf() in java.lang.Integer class
parseInt()

public static int parseInt(String s) throws NumberFormatException {
    return parseInt(s,10);
}

parseInt() method simply parses the String which is passed to it and returns primitive int.

valueOf()

public static Integer valueOf(String s, int radix) throws NumberFormatException {
    return Integer.valueOf(parseInt(s,radix));
}
public static Integer valueOf(int i) {
	final int offset = 128;
	if (i >= -128 && i <= 127) { // must cache
		return IntegerCache.cache[i + offset];
	}
	return new Integer(i);
}

As we can see from the above code, valueOf() method passes the String to the parseInt() method which performs the actual conversion of String and returns the Wrapper Integer. Then it calls the actual valueOf() method, which maintains the pool of Integers ranging -128 to 127 and if the primitive int is within the cache range it returns the Integer from object pool and if the primitive is not within the cache range it will create a new object.

There is always a confusion whether to use parseInt() or valueOf() method, the best option would be if we need the primitive int datatype then we can go for parseInt() method. If you want Wrapper Integer object then go for valueOf() method.

Other interesting articles which you may like …

  • JVM Architecture – Understanding JVM Internals
  • Object and Object Class in Java
  • Difference between JDK, JRE and JVM
  • Components of Java Development Kit (JDK)
  • What is a Class in Java with Example
  • How to open .class file in Java
  • How to Set Classpath for Java in Windows
  • Difference Between ClassNotFoundException Vs NoClassDefFoundError In Java
  • How HashMap works in Java
  • How to make a class Immutable in Java
  • Polymorphism in Java – Method Overloading and Overriding
  • Types of polymorphism in java
  • Types of Inheritance in Java
  • Why Java does not supports Multiple Inheritance – Diamond Problem?

Filed Under: Core Java, Java, Java Interview Tagged With: Integer.parseInt() vs Integer.valueOf(), parseInt vs valueOf

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Java Basics

  • JVM Architecture
  • Object in Java
  • Class in Java
  • How to Set Classpath for Java in Windows
  • Components of JDK
  • Decompiling a class file
  • Use of Class.forName in java
  • Use Class.forName in SQL JDBC

Oops Concepts

  • Inheritance in Java
  • Types of Inheritance in Java
  • Single Inheritance in Java
  • Multiple Inheritance in Java
  • Multilevel Inheritance in Java
  • Hierarchical Inheritance in Java
  • Hybrid Inheritance in Java
  • Polymorphism in Java – Method Overloading and Overriding
  • Types of Polymorphism in java
  • Method Overriding in Java
  • Can we Overload static methods in Java
  • Can we Override static methods in Java
  • Java Constructor Overloading
  • Java Method Overloading Example
  • Encapsulation in Java with Example
  • Constructor in Java
  • Constructor in an Interface?
  • Parameterized Constructor in Java
  • Constructor Chaining with example
  • What is the use of a Private Constructors in Java
  • Interface in Java
  • What is Marker Interface
  • Abstract Class in Java

Java Keywords

  • Java this keyword
  • Java super keyword
  • Final Keyword in Java
  • static Keyword in Java
  • Static Import
  • Transient Keyword

Miscellaneous

  • newInstance() method
  • How does Hashmap works internally in Java
  • Java Ternary operator
  • How System.out.println() really work?
  • Autoboxing and Unboxing Examples
  • Serialization and Deserialization in Java with Example
  • Generate SerialVersionUID in Java
  • How to make a class Immutable in Java
  • Differences betwen HashMap and Hashtable
  • Difference between Enumeration and Iterator ?
  • Difference between fail-fast and fail-safe Iterator
  • Difference Between Interface and Abstract Class in Java
  • Difference between equals() and ==
  • Sort Objects in a ArrayList using Java Comparable Interface
  • Sort Objects in a ArrayList using Java Comparator

Follow

  • Coding Utils

Useful Links

  • Spring 4.1.x Documentation
  • Spring 3.2.x Documentation
  • Spring 2.5.x Documentation
  • Java 6 API
  • Java 7 API
  • Java 8 API
  • Java EE 5 Tutorial
  • Java EE 6 Tutorial
  • Java EE 7 Tutorial
  • Maven Repository
  • Hibernate ORM

About JavaInterviewPoint

javainterviewpoint.com is a tech blog dedicated to all Java/J2EE developers and Web Developers. We publish useful tutorials on Java, J2EE and all latest frameworks.

All examples and tutorials posted here are very well tested in our development environment.

Connect with us on Facebook | Privacy Policy | Sitemap

Copyright ©2023 · Java Interview Point - All Rights Are Reserved ·