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package java.lang;
public abstract class ClassLoader {
    ......
    private transient long classTable;
    ......
}

package dalvik.system;
public class BaseDexClassLoader extends ClassLoader {
    private final DexPathList pathList;
    ......
    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        ......
        Class c = pathList.findClass(name, suppressedExceptions);
        ......
        return c;
    }
    ......
}

package dalvik.system;
public class PathClassLoader extends BaseDexClassLoader {
    ......
}

package dalvik.system;
final class DexPathList {
    ......
    private static DexFile loadDexFile(File file, File optimizedDirectory, 
    ClassLoader loader,Element[] elements)throws IOException {
        if (optimizedDirectory == null) {
            return new DexFile(file, loader, elements);
        } else {
            String optimizedPath = optimizedPathFor(file, optimizedDirectory);
            return DexFile.loadDex(file.getPath(), optimizedPath, 0, 
            loader, elements);
        }
    }
    ......
}