package does not work and jvm does not recognise classes

Question

I have made a console based banking system in my first Java assignment. Everything works well if I use default package but when I add a

   package bank;

at the top of all classes, it can not find classes and there are a lot of errors. How can I solve it?

I searched a lot on Google but didn't understand this thing.

cmd path is ...

C:\Users\Shah\Desktop\Assignment1\src\Bank.java and other classes are also in the same folder.

kindly help me to understand this thing

I tried

     javac *.java

and it compiled

but when I tried to run the byte code by

     java Bank

it gives java.Lang.NoClassDefFound Error

When you compile, are you adding that package to the class path? — Makoto, Feb 19 '14 at 17:46
@Makoto i am trying to add classpath but it gives error class path not defined — Charlie, Feb 19 '14 at 17:48

score 1 · Answer 1 · answered Feb 19 '14 at 17:49

1

If you have just added the package line in you classes.java,

package bank;

then you need to change the structure of your applicationm by adding a new folder named bank then you classes.java that you have been add the link package in.

so you cmd path should look like this :

C:\Users\Shah\Desktop\Assignment1\src\bank\Bank.java

answered Feb 19 '14 at 17:49

Salah

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i added the bank folder and added all classes in it but it is still not working – Charlie Feb 19 '14 at 17:51
You need also to check the cmd path as i mentioned above. – Salah Feb 19 '14 at 17:55
i changed it till bank – Charlie Feb 19 '14 at 17:58
From your update, when you tried `javac *.java`, you are telling the compliter to comple any class exsit in any package, but when tried `javac Bank`, this considering the defual package, and i belive if you said `javac bank.Bank` it will work, you have to tell the compiler from which package compile classes. – Salah Feb 19 '14 at 18:12

score 1 · Answer 2 · edited May 23 '17 at 11:49

I think you need to create another folder 'bank' corresponding to bank package under src folder. src/bank

place all classes under src/bank which defines package bank;

Also you can compile mutiple files using javac com\pack1\pack2\one\*.java com\pack1\pack2\two\.*java

then try to run.

For example image below shows package pack1 which contains a Test.java class with package definition Image shows compiling different java classes

For more info refer this question

package does not work and jvm does not recognise classes

2 Answers2