class Song3 extends Object120 {
    private String artist;
    private String title;
    private double length;  // running time, in s.
    private boolean isCopyrighted;
    
    public static final double MB_PER_SEC = 3.0;
    
    // the "constructor":
    public Song3( String a, String t, double l, boolean isC ) {
        // Song3 this = /* a Song3 object w/ all fields "zero-ish" */;  // implicit -- don't write it!
        this.artist = a;
        this.title = t;
        this.length = l;
        this.isCopyrighted = isC;
        // return this;    // implicit -- don't write it!
    }
    
     
    /** return whether `s` can be stored using `space` disk-space.
     * @param s the song to consider
     * @param space the amount of available space it has to fit into, in B.
     */
    public boolean willFit( /*Song3 thiss,*/ int space ) {
        return this.getDiskSpace() <= space;
    }
    
    /** @return how much space this song takes on disk, as an mp3, in B. */
    public double getDiskSpace( /* Song3 this */ ) {
        return (this.getLength()/60.0) * MB_PER_SEC * Math.pow(2,20);
    }
    
    /** return whether one song is shorter than another.
     * @return whether s1 is shorter than s2.
     */
    public boolean isShorter( /*Song3 this,*/ Song3 that ) {
        return (this.getLength() < that.getLength());
    }
    
    String getArtist( /*Song3 this */ ) {
        return this.artist;
    }
    String getTitle( /*Song3 this */ ) {
        return this.title;
    }
    public double getLength( /*Song3 this */ ) {
        return this.length;
    }
    public boolean getIsCopyrighted( /*Song3 this */ ) {
        return this.isCopyrighted;
    }
    
    private void setArtist( /* Song3 this, */ String newArtist ) {
        this.artist = newArtist;
    }
    private void setTitle( /* Song3 this, */ String newTitle ) {
        this.title = newTitle;
    }
    /** @param newLength -- must be >= 0 */
    private void setLength( /* Song3 this, */ double newLength ) {
        if (newLength < 0) {
            throw new IllegalArgumentException("length can't be negative!");
        }
        this.length = newLength;
    }
    public void setIsCopyrighted( /* Song3 this, */ boolean newIsCopyrighted ) {
        this.isCopyrighted = newIsCopyrighted;
    }
    
    
    /** return a remix of a song.
     * @return `orig` remixed by D.J. `dj`, who added `newMaterialLength` seconds of ill beatz.
     */
    Song3 remix( /* Song3 this, */ String dj, double newMaterialLength ) {
        return new Song3( this.getArtist() + " vs " + dj,
                          this.getTitle() + " (" + dj + " remix)",
                          this.getLength() + newMaterialLength,
                          false );
    }
    
    
    
    static void testAll() {
        // some examples of Song3 objects:
        Song3 s1 = new Song3("Lil Nas X", "Old Town Road", 120, true);
        Song3 s2 = new Song3("Abba", "Ring Ring", 180, true);
        Song3 s2a = new Song3("Abba", "Ring Ring", 180, true);
        
        assertEquals( s1.isShorter(s2), true );
        assertEquals( s2.isShorter(s1), false );
        assertEquals( s1.isShorter(s1), false );
        
        assertEquals( s1.willFit(4000), false);
        
        printTestMsg("remix");
        assertEquals( new Song3( "Lil Nas X vs ibarland",
                                 "Old Town Road (ibarland remix)",
                                 150,
                                 false ),
                      s1.remix("ibarland", 30) );
        assertEquals( new Song3("Abba vs saltman", "Ring Ring (saltman remix)", 180, false),
                      s2.remix("saltman", 0) );
                      
        assertEquals( s1.getIsCopyrighted(), true );
        s1.setIsCopyrighted(false);
        assertEquals( s1.getIsCopyrighted(), false );
        
                      
                      
        printTestSummary();
    }
    
    public static void main( String[] args ) { testAll(); }
    
}