Online Training Spring Hibernate Training in Delhi R Programming Training Course Big Data and Hadoop Training Java Training

Autoboxing in Java

Autoboxing in Java is the automatic transformation of primitive data types ((int, float, double) into their corresponding Wrapper class object (Integer, Float, Double) by Java compiler.

Ads

Tutorials   
Java final method Assert in Java Final method in java Autoboxing in Java assert In Java JDBC batch insert using Java bean class Java Singleton Pattern Java Collection API - Java Tutorials Stack Overflow - Java Tutorials End of Year Puzzle The link to the outer class,java tutorial,java tutorials Orientating Components Right to Left,java newsletter,java,tutorial Non-virtual Methods in Java - java tutorials Multicasting in Java - java tutorials,tutorial Creation Time Comparison of Multi Dimensional Array- Java Tutorials Making Exceptions Unchecked - java tutorial,java tutorials Making Enumerations Iterable - JDK 5 Example Which is Faster - LinkedList or ArrayList? LinkedHashMap - Java Tutorials HashMap and HashCode JDK 1.4 the NullPointerException - Java Tutorials Java HashMap - Java Tutorials Java GC java awt package tutorial Java Multi Dimensions Array - Java Tutorials Java HashSet  - Java Tutorials Java Field Initialisation - Java Tutorials Java Comments - Java Tutorials J2EE Singleton Pattern - Design Pattern Tutorials Java - JDK Tutorials garbage collection in java Final Methods - Java Tutorials Exceptional Constructors - Java Tutorials Double-checked locking,java tutorials,java tutorial Disassembling Java Classes - Java Tutorials Java Deadlocks - Java Deadlocks Tutorials, Deadlocks in Java Commenting out your code - Java Tutorials Class names don't identify a class - Java Tutorials Causing Deadlocks in Swing Code Exception in Java - Java Tutorials Catching Exceptions in GUI Code - Java Tutorials boolean comparisons - tutorial Interthread Communication in Java BASIC Java - Java Tutorials Thread Deadlocks - Java Tutorials Autoboxing unboxing in Java - Java Tutorials Assertion in Java Appending Strings - Java Tutorials Anonymous Inner Classes - Anonymous Inner Classes tutorial Assertion in java
Ads

Autoboxing in Java is the automatic transformation of primitive data types ((int, float, double) into their corresponding Wrapper class object (Integer, Float, Double) by Java compiler.

One must also know about Unboxing, which means he automatic transformation of wrapper class object into their corresponding primitive data types.

Autoboxing or automatic transformation of primitive data types into Wrapper class by Java compiler takes place when:

  • a primitive data type is passed in a parameter of method, which is expecting an object of corresponding wrapper class
  • a primitive data type is assigned to a variable of the corresponding wrapper class.
Primitive data type Wrapper class
boolean Boolean
int Integer
char Character
float Float
double Double
byte Byte
long Long
short Short

Following is the example of Autoboxing in Java:

public class MainClass {
public static void main(String args[]) {
Boolean booleanObject = true;

if (booleanObject){
System.out.println("a is true");
}

Integer i = 'x'; // box a int
int i2 = i; // unbox a int

System.out.println("i2 is " + i2);
}
}

Output:

a is true
i2 is x

Advertisements

Ads

Online Training Classes

Share on Google+Share on Google+

Autoboxing in Java

Posted on: May 15, 2013 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Advertisements

Ads
 

Discuss: Autoboxing in Java  

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments:0

Ads

 

Ads