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Interchanging Numeric Values In Java

java-display

April 30, 2017
Published By : Pratik Kataria
Categorised in:

Try out the code

public class ConvertNumericVal {
	
	public static void main( String[] args ){
		int intVal = 30;
		int intVal1 = intVal;  //We got two copies of the value

		System.out.println("intVal1 is: " +intVal1);

		long longVal = intVal1;

		System.out.println("longVal is: " +longVal);

		//short shortVal = intVal1; //ERROR!

		short shortVal = (short) intVal1;  //typecasting -> narrowing the type

		System.out.println("shortVal is: " +shortVal);

		int intVal2 = 700;

		//byte byteVal =  intVal2; //ERROR!

		byte byteVal = (byte) intVal2;  //risk of losing data

		System.out.println("byteVal is: " +byteVal);

		double doubleVal = 1.91111d;

		int intVal3 = (int) doubleVal;  //narrowing. Truncation results in loss of data.

		System.out.println("intVal3 is: " +intVal3);
	}

}

Notes:

  • While working with primitives, you’re always making copy of value. You are not creating reference to original value.
  • Converting from a type which uses smaller amount of memory to a type which uses larger amount of memory is called widening the type.
  • From amount of memory type to smaller amount of memory type -> narrowing the type.
  • Widening type is automatic. No risk of losing data.
  • Narrowing type requires typecasting. Risk of losing data.

Output

  • intVal1 is: 30
  • longVal is: 30
  • shortVal is: 30
  • byteVal is: -68
  • intVal3 is: 1