Step 3:Java Components (jvm,jre,jdk) : 1st Day

(a) J.V.M (Java Virtual Machine)-

J.v.m = j.i.t(just-in-time compiler)+cache

-J.V.M DOESN’T EXISTS PHYSICALLY,

-J.V.M PROVIDES SPECIFICATIONS TO EXECUTE JAVA BYTE-CODE.

-J.V.M IS PLATFORM DEPENDENT AND EASILY AVAILABLE FOR MANY PLATFORMS(OS)

*JVM INTERNAL ARCHITECTURE*-

(b)JRE (Java Runtime Environment)-

– IMPLEMENTATION OF JVM.

– PHYSICALLY EXISTS.

JRE = JVM + SET OF LIBRARIES (I.E. JAR) + OTHER FILES

(c)JDK (Java Development Kit)-

– PHYSICALLY EXISTS.

JDK = JRE + DEVELOPMENT TOOLS(I.E. JAVAC, JAVA ETC)