class Single {
    //private String artist;
    private Song3 aSide;
    private Song3 bSide;
    
    Single( String _artist, Song3 _aSide, Song3 _bSide ) {      
        if (! _artist.equals(_aSide.getArtist())) {
            throw new IllegalArgumentException("Artist " + _artist + "doesn't match A-side artist" + _aSide.getArtist() + ".");
        }
        this.aSide = _aSide;
        this.bSide = _bSide;
    }
    @Override
    public int hashCode() { return 23; }
//    public String toString( /* Single this */ ) {
  //      return this.getTitle() + " by " + this.getArtist();
  //  }
    
    public String getTitle( /* Single this */ ) {
        return this.aSide.getTitle() + " b/w " + this.bSide.getTitle();
    }
    
    public String getArtist( /* SIngle this */ ) {
        return this.aSide.getArtist();
    }
    
    /** @return the running-time of the entire single, in seconds.
     */
    public double getLength( /* Single this */ ) {
        return this.getLength(true) + 1 + this.getLength(false);
    }
    
    public double getLength( /* Single this */ boolean useSideA ) {
        return (useSideA  ?  this.aSide  :  this.bSide).getLength();
    }
    
    
    
    
    private static void testAll() {
        Single tt = new Single( "Ke$ha", new Song3("Ke$ha","Tik Tok",182,true), new Song3("Ke$ha", "Up the Clock", 92, false) );
        Object120.printTestMsg("Single#getTitle");
        Object120.assertEquals( tt.getTitle(), "Tik Tok b/w Up the Clock" );
        
        Object120.assertEquals( tt.getLength(), 48.0 );
        Object120.assertEquals( tt.getLength(true), 23.0 );
        Object120.assertEquals( tt.getLength(false), 24.0 );
        
    }

    public static void main( String[] args ) { testAll(); }
}