class Song extends Object120 {

    String title;
    String artist;
    double length;
    boolean isCopyrighted;
    
    /** Constructor.
     * @param title The song's title.
     * @param artist The name of performer/band.
     * @param length running time, in seconds.
     * @param isCopyrighted Is this song under copyright?
     */
    Song( String t, String a, double l, boolean c ) {
        super(t,a,l,c); 
    }
    
    /** Can a song fit into the given free space on a disk?
     * @param a The song to try to fit.
     * @param freeMegs the amount of free space to fit into, in MB.
     * @return whether `aSong` fits into `freeMegs` MB of disk space.
     * (For class purposes: 1 minute requires 1MB (that's plausible for mp3).)
     */
    static boolean fitsOnDisk( Song aSong, double freeMegs ) {
        return true;
    }
    
    static Song longerOf( Song tune1, Song tune2 ) {
        return tune1;
    }

    static Song mashUp( Song tune1, Song tune2 ) {
        return tune1;
    }

    
    static void testSongs() {
        Song s1;
        s1 = new Song( "Help!", "The Beatles", 122.3, true );
        Song s2;
        s2 = new Song( "Yes", "Coldplay", 7*60+7, true );
        
        testEqualBools( fitsOnDisk(s1, 2.0), true );
        testEqualBools( fitsOnDisk(s2, 2.0), false );
        testEqualBools( fitsOnDisk(s1, 0.0), false );
        testEqualBools( fitsOnDisk(s2, 0.0), false );
        // new Song("sound of silence","anonymous",0,false)
    }
    
    
    /** If two booleans aren't equal, print an error message.
     * Intended for use as a test-helper.
     * @param act The actual boolean returned by a test call.
     * @param exp The expected boolean to be returned by a test call.
     */
    static void testEqualBools(boolean act, boolean exp) {
      if (act==exp) {
        System.out.println("(test passed)");
      }
      else {
        System.out.println( "Actual: " + act + "\nExpect: " + exp );
      }
    }
    
    /** If two Songs aren't equal, print an error message.
     * Intended for use as a test-helper.
     * @param act The actual Song returned by a test call.
     * @param exp The expected Song to be returned by a test call.
     */
    static void testEqualSongs(Song act, Song exp) {
      if (equals(act,exp)) {
        System.out.println("(test passed)");
      }
      else {
        System.out.println( "Actual: " + act + "\nExpect: " + exp );
      }
    }

    /** If two Strings aren't equal, print an error message.
     * Intended for use as a test-helper.
     * @param act The actual String returned by a test call.
     * @param exp The expected String to be returned by a test call.
     */
    static void testEqualStrings(String act, String exp) {
      if (equals(act,exp)) {
        System.out.println("(test passed)");
      }
      else {
        System.out.println( "Actual: " + act + "\nExpect: " + exp );
      }
    }

}