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Tip of the Day
Language: Java
Expertise: Advanced
Nov 11, 2008

Make an Immutable Class

The following code shows how to make an immutable class:

package com.test;

final class TestImmutable
{
//	instance var are made private to restrict the access  
//	and final to not get reassigned

	private final int var1;
	private final double var2;

	public TestImmutable(int paramCount,double paramValue)
	{
		var1= paramCount;
		var2 = paramValue;
	}

//	Only accessors are provided i.e getters to access the variables

	public int getVar1()
	{
		return var1;
	}

	public double getVar2()
	{
		return var2;
	}
}

//class TestingImmutable
public class TestingImmutable
{
	public static void main(String[] args)
	{
		TestImmutable obj1 = new TestImmutable(3,5);

		System.out.println(obj1.getVar1());
		System.out.println(obj1.getVar2());

		// There is no other way to change the values of var1 & var2
		//only accessors getVar1(),getVar2() to get the values 
		// no subclassing, no public access to varX
	}
}
Devesh Gote
 
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