What do you understand by numeric promotion ?
Answer : Numeric promotion also known as Implicit casting or java automatic conversions where conversion of a smaller numeric type value to a larger numeric type automatically, so integral and floating-point operations could take place. In numerical promotion or implicit casting the byte, char, and short values will be converted to int values and the int values will be converted to long values, if necessary. The long and float values are converted to double values, as well.Please see example below:
package com.javahonk.implicitCasting; public class NumericPromotionExample { public static void main(String[] args) {// initialize byte byte a = 100; // implicit or widening or automatic conversion to short short b = a; // implicit or widening or automatic conversion to int int c = b; // implicit or widening or automatic conversion to long long d = c; // implicit or widening or automatic conversion to float float e = d; // implicit or widening or automatic conversion to double double f = e; System.out.println("All value implicitely 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); // char to int implicit conversion char g = 'f'; int i = g; // Please note when java promotes from char to int // it will print ASCII value of char System.out.println("char to int implicit conversion value: " + i);} }
Output:
