Вот мой Java код:Как выйти из нулевого значения в цикле в Java
public class DVD {
public static void main(String[] args) {
DVD newdvd1 = new DVD();
newdvd1.setPlayit("The song is playing \n");
newdvd1.setArtist("Eva Cassidy");
newdvd1.setTitle("Songbird");
newdvd1.setGenre("Blues");
System.out.println(newdvd1.getPlayit());
System.out.println(newdvd1);
DVD newdvd2 = new DVD();
newdvd2.setPlayit("The next song is playing \n");
newdvd2.setArtist("an unknown artist");
newdvd2.setTitle("new song");
System.out.println(newdvd2.getPlayit());
System.out.println(newdvd2);
}
private String artist;
private String title;
private String genre;
private String playit;
public String getPlayit() {
return playit;
}
public void setPlayit(String playit) {
this.playit = playit;
}
public String getArtist() {
return artist;
}
public void setArtist(String artist) {
this.artist = artist;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getGenre() {
return genre;
}
public void setGenre(String genre) {
this.genre = genre;
}
public String toString() {
return ("The artist is called " + artist +
" who is a "+ genre + " singer" +
" and this song is called " + title + ".\n");
}
}
, что он выдает это:
The song is playing
The artist is called Eva Cassidy who is a Blues singer and this song is called Songbird.
The next song is playing
The artist is called an unknown artist who is a null singer and this song is called new song.
То, что я спрашиваю, во второй песне , как я могу оставить «нулевой певец», поскольку я не хочу отображать второй жанр песен?
'если (что-то == NULL) {doSomethingSpecial(); } ' – Thilo