JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a simple generics class example with two type parameters.


Below example shows how to create a simple generics class with two type parameters. Look at the class definition, we defined two types of parameters called U & V, seperated by ",". You can define multiple type parameters seperated by ",". Look at sample code for more comments.


package com.java2novice.generics;

public class MySimpleTwoGenerics {

	public static void main(String a[]){
		
		SimpleGen<String, Integer> sample
					= new SimpleGen<String, Integer>("JAVA2NOVICE", 100);
		sample.printTypes();
	}
}

/**
 * Simple generics class with two type parameters U, V. 
 */
class SimpleGen<U, V>{
	
	//type U object reference
	private U objUreff;
	//type V object reference
	private V objVreff;
	
	//constructor to accept object type U and object type V
	public SimpleGen(U objU, V objV){
		this.objUreff = objU;
		this.objVreff = objV;
	}
	
	public void printTypes(){
		System.out.println("U Type: "+this.objUreff.getClass().getName());
		System.out.println("V Type: "+this.objVreff.getClass().getName());
	}
}

Output:
U Type: java.lang.String
V Type: java.lang.Integer
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Java Generics Sample Code Examples

  1. Write a simple generics class example.
  2. Write a simple generics class example with two type parameters.
  3. How implement bounded types (extend superclass) with generics?
  4. How implement bounded types (implements an interface) with generics?
  5. What is generics wildcard arguments? Give an example.
Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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