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
Class, Constructor and Primitive data types
Class is a template for multiple objects with similar features and it is a blue print for objects. It defines a type of object according to the data the object can hold and the operations the object can perform. Constructor is a special kind of method that determines how an object is initialized when created. Primitive data types are 8 types and they are: byte, short, int, long, float, double, boolean, char.
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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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