Проверка закрытия потока

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class MyOutputStream extends FileOutputStream {

    private boolean isClosed = false;
    
    public MyOutputStream(File file, boolean append) throws FileNotFoundException {
        super(file, append);
    }

    public MyOutputStream(File file) throws FileNotFoundException {
        super(file);
    }

    public MyOutputStream(FileDescriptor fdObj) {
        super(fdObj);
    }

    public MyOutputStream(String name, boolean append) throws FileNotFoundException {
        super(name, append);
    }

    public MyOutputStream(String name) throws FileNotFoundException {
        super(name);
    }

    @Override public void close() throws IOException {
        isClosed = true;
        super.close();
    }
    
    public synchronized boolean isClosed(){
        return this.isClosed;
    }
    
}