[Java] Comparable 인터페이스 사용법

1. CLASSNAME implements Comparable<CLASSNAME>

2. compareTo 메서드 오버라이드

 

@Override
public int compareTo(Animal other) {
    return Integer.compare(this.year_discovered, other.year_discovered);
}

 

ref : stackoverflow.com/questions/21626439/how-to-implement-the-java-comparable-interface