What is Down-casting

What is Down-casting

Answer : Though java automatic type conversions are helpful, they could not fulfill all our needs. Lets say for example if you want to assign an int value to a byte variable? This conversion will not be performed automatically, because a byte is smaller than an int. This kind of conversion is called an explicit or narrowing conversion because you are explicitly making the value narrower so that it will fit into the target type.

To do explicit conversion between two incompatible types, you would need to use a cast. A cast is simply an explicit type conversion. Below is its general form:

(target-type) value


Please have example below:

package com.javahonk.implicitCasting;

public class ExplicitCastingExample {

    public static void main(String[] args) {

	// initialize double
	double f = 100;
	// explicit or narrow conversion from double to float
	float e = (float) f;
	// explicit or narrow conversion from float to long
	long d = (long) e;
	// explicit or narrow conversion from long to int
	int c = (int) d;
	// explicit or narrow conversion from int to short
	short b = (short) c;
	// explicit or narrow conversion from short to byte
	byte a = (byte) b;

	System.out.println("All value explictely converted:");
	System.out.println("byte: " + a);
	System.out.println("shot: " + b);
	System.out.println("int: " + c);
	System.out.println("long: " + d);
	System.out.println("float: " + e);
	System.out.println("double: " + f);





All value explictely converted:
byte: 100
short: 100
int: 100
long: 100
float: 100.0
double: 100.0


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