compiling java package classes. Cannot access Class. class file contains wrong class while working with packages -

i trying compile few files in package in java. package name library. please have @ following details.

this directory structure:

javalearning ---library ------parentclass.java ------childclass.java 

i tried compile in following way:

current directory: javalearning

javac library/parentclass.java   //this compilation works fine  javac library/childclass.java    //error on here 

the following parentclass.java:

package library; class parentclass{ ... } 

the following childclass.java:

package library; class childclass extends parentclass{ ... } 

the error follows:

cannot access parentclass bad class file: .\library\parentclass.class please remove or make sure appears in correct sub directory of classpath 

you've got casing issue:

class parentclass 

that's not same filename parentclass.class, nor same class you're trying use in childclass: class childclass extends parentclass.

java classnames case-sensitive, windows filenames aren't. if class had been public, compiler have validated names matched - non-public classes, there's no requirement that.

the fact you've ended parentclass.class suggests @ some point declared parentclass, changed declared name , when recompiling, windows overwrote content of current file rather creating parentclass.class.

make sure declared class name exactly matches filename. may want delete class files before recompiling, out of confusing state.