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Integer Wrapper class

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Integer Wrapper class Posted: Jun 18, 2015 7:36 AM
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Original Post: Integer Wrapper class
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  • Integer  class is present in java.lang package.
  • java.lang.Integer  is used to represent integer primitive value in form of object.

Class Definition

  1. public final class Integer
  2. extends Number 
  3. implements Comparable<Integer>

Integer Class Constructors

1.public Integer(int value):
  • It takes int primitive value as an argument.
Java code to convert int primitive to Integer object


  1. package com.instanceofjavatutorial;
  2.  
  3. public class IntegerDemo {
  4.  
  5. public static void main(String[] args) {
  6.  


  9.  Integer obj=new Integer (37);
  10.  
  11.  System.out.println(obj);
  12.  
  13.  
  14. }
  15. }

Output:
  1. 37

2.public Integer(String s)  throws NumberFormatException:

  • It takes String value as an argument. 

Java code to convert String to Integer object


  1. package com.instanceofjavatutorial;
  2.  
  3. public class IntegerDemo {
  4.  
  5. public static void main(String[] args) {
  6.  


  9.  Integer obj=new Integer ("123");
  10.  
  11.  System.out.println(obj);
  12.  
  13.  
  14. }
  15. }

Output:
  1. 123

Read: Integer Wrapper class

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