我正在尝试制作一个printstream，每次调用其方法时都不执行任何操作。该代码显然没有错误，但是当我尝试使用它时，我得到了java.lang.NullPointerException: Null output stream。我在做什么错了？

public class DoNothingprintstream extends printstream {
    
    public static final DoNothingprintstream doNothingprintstream = new DoNothingprintstream();

    private static final OutputStream support = new OutputStream() {
        public void write(int b) {}
    };
    // ======================================================
        // TODO | Constructor
    
    /** Creates a new {@link DoNothingprintstream}.
     * 
     */
    private DoNothingprintstream() {
        super( support );
        if( support == null )
            System.out.println("DoNothingStream has null support");
    }
    
    
}