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| package Java0326.Lecture15.Map;
import java.util.HashMap;
import java.util.Map;
class Member{
private String name;
private String phone; // 폰넘버
public Member(String name, String phone) {
super();
this.name = name;
this.phone = phone;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((phone == null) ? 0 : phone.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Member other = (Member) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (phone == null) {
if (other.phone != null)
return false;
} else if (!phone.equals(other.phone))
return false;
return true;
}
/*
@Override
public boolean equals(Object obj) { // 묵시적 형변환
boolean result = false;
Member mem = (Member)obj; // 명시적 형변환
if(name.equals(mem.name) && phone.equals(mem.phone)) {
result = true;
}
return result;
}
*/
}
class Car{
private String name; // 차량 이름
private String id; // 차량번호
public Car(String name, String id) {
super();
this.name = name;
this.id = id;
}
}
class MemberInfo{
private Member m;
private Car c;
public MemberInfo(Member m, Car c){
this.m = m;
this.c = c;
}
}
class Test{
public Map<String, Object> returnTest() {
Member m = new Member("aaa", "1111");
Car c = new Car("bbb", "ccc");
Map<String, Object> map = new HashMap();
map.put("Member", m);
map.put("Car", c);
return map;
}
// public MemberInfo returnTest3() {
// Member m = new Member();
// Car c = new Car();
// MemberInfo info = new MemberInfo(m, c);
// return info;
// }
/*
public Object[] returnTest() {
Member m = new Member();
Car c = new Car();
Object[] arr = new Object[2];
arr[0] = m;
arr[1] = c;
return arr;
}
*/
}
public class MapMain02 {
public static void main(String[] args) {
Map<Member, Car> carList = new HashMap<>();
carList.put(new Member("홍길동", "010-1111-2222"), new Car("소나타", "12소1212"));
carList.put(new Member("윤길동", "010-3333-4444"), new Car("모닝", "34가6354"));
carList.put(new Member("박길동", "010-5555-6666"), new Car("그랜저", "26도4623"));
carList.put(new Member("강길동", "010-7777-8888"), new Car("카니말", "81고3456"));
System.out.println("등록대수 : " + carList.size());
carList.put(new Member("홍길동", "010-8888-9999"), new Car("SM3", "25다3434"));
System.out.println("등록대수 : " + carList.size());
carList.put(new Member("홍길동", "010-1111-2222"), new Car("제네시스", "42너3524"));
System.out.println("등록대수 : " + carList.size());
/*
// equals가 true면서 hashcode 값도 동일해야한다...
Member m = new Member("홍길동", "010-1111-2222");
Member m2 = new Member("홍길동", "010-1111-2222");
System.out.println(m); // Member@71dac704 @뒤가 hashcode
System.out.println(m2); // Member@123772c4
*/
/*
Member m = new Member("홍길동", "010-1111-2222");
Member m2 = new Member("홍길동", "010-1111-2222");
if(m.equals(m2)) {
System.out.println("같은 사람입니다.");
} else {
System.out.println("다른 사람입니다.");
}
// equals 메소드를 오버라이드 필요(주소값 비교로 equals를 안하도록)
*/
}
}
|
