Regarding java program running...

Question

Hi
I know it a very basic question...I am learning java before that i used netbeans and now i want to work with java without any ide like netbeans..
I want to type my program in notepad and run that...
My program is in c:program\java...When i run the command java -version i got the version details from the above prompt...but when i tried Java Command i am getting the error of java.NoClassDefFoundError....
so that i can't compile my program..
Anybody help me regarding this

Answer 1

Its worth noting that valueOf creates an object of the type and parseXxxx returns a primitive of the type.
With auto-boxing and auto-unboxing the distinction is not so apparent but there are subtle differences.
e.g.
String number = ...
Double d1 = Double.valueOf(number);
double d = Double.parseDouble(number);
Integer i1 = Integer.valueOf(number);
int i2 = Integer.parseInt(number);
// you can also do
int i3 = Integer.valueOf(number); // uses unboxing and is slightly less efficient.
// uses Integer.valueOf(int) to auto-box which uses the builtin Integer object cache
// Whereas Integer.valueOf(String) doesn't so it can me more efficient than i1 above.
Integer i4 = Integer.parseInt(number);