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.
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What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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