public interface Comparator { int compare(Object o1, Object o2); boolean equals(Object obj); // equals를 overriding 하라는 } public interface Comparable { int compareTo(Object o); } Integer에 구현된 comparable public final class Integer extends Number implements Comparable { public int compareTo(Integer anotherInteger){ int v1 = this.value; // 나 자신 int v2 = anotherInteger.value; // 받은 값 return (v1 < v2 ..