习题

 class TapeDeck {
boolean canRecord = false;
void playTape() {
System.out.println(“tape playing”);
}
void recordTape() {
System.out.println(“tape recording”);
}
}
class TapeDeckTestDrive {
public static void main(String [] args) {
t.canRecord = true;
t.playTape();
if (t.canRecord == true) {
t.recordTape();
}
}
}

class DVDPlayer {
boolean canRecord = false;
void recordDVD() {
System.out.println(“DVD recording”);
}
}
class DVDPlayerTestDrive {
public static void main(String [] args) {
DVDPlayer d = new DVDPlayer();
d.canRecord = true;
d.playDVD();
if (d.canRecord == true) {
d.recordDVD();
}
}
}