@Transient
public String getFamily() {
StringBuilder builder = new StringBuilder();
builder.append(this.name);
if (kittens != null) {
for (Kitten kitten : kittens) {
builder.append(", ").append(kitten.getName());
}
}
if (otherCat != null) {
builder.append("\n\t").append(otherCat.getFamily());
}
return builder.toString();
}
private void initAllKitten() throws InterruptedException {
kitten1.start();
kitten2.start();
kitten1.join();
kitten2.join();
}