Java Casting

"Read R to L"

ie Is "what is on the right" always "what is on the left" ?

Example 1) 
String str ="word";
Comparable p = str;//OK String is a Comparable 

"a String(str) is a Comparable"
	
Remember Strings implements the Comparable interface
	



Bad
String str="words"
Comparable p ="str;
String t = p; //BAD  becuase NOT all Comparables are Strings

  

Ok if you (cast)
String str="words"
Comparable p ="str;
String t = (String)p ; // OK becuase NOT all Comparables are Strings



  

C1 implements i1 and i2 C c1 = i1 ;;yes