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Tip of the Day
Language: Java
Expertise: Beginner
Feb 18, 2000

Passing Primitive Data by Reference

Primitive datatypes in Java are always a passby value. You can pass them by reference, by wrapping the data in to single element array. Here is the code (Tested on Java 1.2) :
 
public class PassByReferance {
	public static void main(String args[]){
		double value = 1234.000;
		PassByReferance.manipulate(value);
		System.out.println(" Value of Double is : " + value);
		// No Change
		// Will Print : Value of Double is : 1234.0

		double[] wrapper = new double[1];
		wrapper[0] = value;
		PassByReferance.manipulate(wrapper);
		System.out.println(" Value of Doubleis : " + wrapper[0]);
		// Data Changed
		// Will Print : Value of Double is : 6170.0
	}

	static void manipulate(double[] data){
		data[0] = data[0] * 5;
	}

	static void manipulate(double data){
		data = data * 5;
	}
}
You can also try this with other datatypes.
Nilesh Shah
 
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