Java Class from Package getClasses(String packageName)

Description

Returns all classes from specified package.

License

Open Source License

Parameter

Parameter	Description

Return

array of classes.

Declaration

public static Class[] getClasses(String packageName) throws ClassNotFoundException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.net.URL;
import java.util.ArrayList;

public class Main {
    /**//from   w  ww  . j a  v a2  s .  c  o m
     * Returns all classes from specified package.
     * @param pckgname, full name of package.
     * @return array of classes.
     */
    public static Class[] getClasses(String packageName) throws ClassNotFoundException {
        ArrayList<Class> classes = new ArrayList<Class>();
        // Get a File object for the package
        File directory = null;
        try {
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            if (classLoader == null) {
                throw new ClassNotFoundException("Can't get class loader.");
            }
            //String path = '/' + pckgname.replace('.', '/');
            String path = packageName.replace('.', '/');
            URL resource = classLoader.getResource(path);
            if (resource == null) {
                throw new ClassNotFoundException("No resource for " + path);
            }
            directory = new File(resource.getFile());
        } catch (NullPointerException x) {
            throw new ClassNotFoundException(
                    packageName + " (" + directory + ") does not appear to be a valid package");
        }
        if (directory.exists()) {
            // Get the list of the files contained in the package
            String[] files = directory.list();
            for (int i = 0; i < files.length; i++) {
                // we are only interested in .class files
                if (files[i].endsWith(".class")) {
                    // removes the .class extension
                    classes.add(Class.forName(packageName + '.' + files[i].substring(0, files[i].length() - 6)));
                }
            }
        } else {
            throw new ClassNotFoundException(packageName + " does not appear to be a valid package");
        }
        Class[] classesA = new Class[classes.size()];
        classes.toArray(classesA);
        return classesA;
    }
}

Related

1. getClasses(String packageName)
2. getClasses(String packageName)
3. getClasses(String packageName)
4. getClasses(String packageName)
5. getClasses(String packageName)
6. getClasses(String packageName)
7. getClasses(String packageName)
8. getClasses(String packageName, Class inheritedType)
9. getClasses(String pckgname)