SE450: Java: coercion [14/22]

There are many types of conversions that take place in Java:

• identity
• widening of primitives
• narrowing of primitives
• widening a reference
• narrowing a reference
• String conversions (on primitives)

These will show up in

• assignment
• method invocation
• casting
• numeric promotion

Widening and narrowing of references is done via casting (later).

public class Coercion {

    final static int X = 33;

    public static void main(String args[]) {
	int x = 5;
	double y = 4.5;
	System.out.println("x + y = " + (x + y)); // widening
	
	//int z = y; (narrowing - not allowed)
	int z = (int)y; // lossy
	short xx = X; // not lossy, java will do this for you
	// short xy = z; // lossy - not allowed

    }

}