Java Assignment3 upload by HyunsooJung

me/day05/practice/ArrayUtil.java

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+package me.day05.practice;
+
+import java.util.List;
+
+public class ArrayUtil {
+
+    static <T> T[] listToArray(List<T> list) {
+        T[] resultArray = (T[]) new Object[list.size()];
+
+        for (int i = 0; i < resultArray.length; i++)
+            resultArray[i] = list.get(i);
+
+        return resultArray;
+    }
+}

me/day05/practice/Electronic.java

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+package me.day05.practice;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.util.Arrays;
+import java.util.Objects;
+
+public class Electronic {
+
+    enum CompanyName { SAMSUNG, LG, APPLE }
+    enum AuthMethod { FINGERPRINT, PIN, PATTERN, FACE }
+
+    private static final int MAX_REGISTRATION_NUMBER = 9999;
+
+    private static int registrationNo;
+
+    private String productNo;
+    private String modelName;
+    private CompanyName companyName;
+    private String dateOfMade;
+    private AuthMethod[] authMethod;
+
+    Electronic () {
+        registrationNo++;
+        setDateOfMade();
+        setProductNo();
+    }
+
+    Electronic (String modelName, CompanyName companyName, AuthMethod[] authMethod) {
+        this();
+        this.modelName = modelName;
+        this.companyName = companyName;
+        this.authMethod = authMethod;
+    }
+
+    private void setDateOfMade(){
+        DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("yyMMdd");
+        dateOfMade = timeFormatter.format(LocalDate.now());
+    }
+
+    private void setProductNo(){
+        if (registrationNo >= MAX_REGISTRATION_NUMBER) resetRegistrationNo();
+        productNo = dateOfMade + String.format("%4d", registrationNo).replace(" ", "0");
+    }
+
+    private void resetRegistrationNo(){
+        registrationNo = 1;
+    }
+
+    public boolean isContainAuthMethod(AuthMethod authMethod){
+        for (AuthMethod auth : this.authMethod)
+            if (authMethod.equals(auth)) return true;
+        return false;
+    }
+
+    public String getProductNo() {
+        return productNo;
+    }
+
+    public String getModelName() {
+        return modelName;
+    }
+
+    public void setModelName(String modelName) {
+        this.modelName = modelName;
+    }
+
+    public CompanyName getCompanyName() {
+        return companyName;
+    }
+
+    public void setCompanyName(CompanyName companyName) {
+        this.companyName = companyName;
+    }
+
+    public String getDateOfMade() {
+        return dateOfMade;
+    }
+
+    public AuthMethod[] getAuthMethod() {
+        return authMethod;
+    }
+
+    public void setAuthMethod(AuthMethod[] authMethod) {
+        this.authMethod = authMethod;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productNo, modelName, companyName, dateOfMade, Arrays.hashCode(authMethod));
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(productNo, ((Electronic)obj).productNo);
+    }
+
+    @Override
+    public String toString() {
+        return "Electronic { " +
+                "productNo=" + productNo +
+                ", modelName=" + modelName +
+                ", companyName= " + companyName +
+                ", dateOfMade=" + dateOfMade +
+                ", authMethod=" + Arrays.toString(authMethod) + " }";
+    }
+}

me/day05/practice/ElectronicArrayUtil.java

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+package me.day05.practice;
+
+import java.util.List;
+
+public class ElectronicArrayUtil {
+
+    static Electronic[] listToArray(List<Electronic> list) {
+        Electronic[] resultArray = new Electronic[list.size()];
+
+        for (int i = 0; i < resultArray.length; i++)
+            resultArray[i] = list.get(i);
+
+        return resultArray;
+    }
+}

me/day05/practice/Electronics.java

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+package me.day05.practice;
+
+import me.day05.practice.Electronic.AuthMethod;
+import me.day05.practice.Electronic.CompanyName;
+
+import java.util.*;
+
+public class Electronics {
+
+    private static final int DEFAULT_CAPACITY = 10; // Default initial capacity
+    private static final Electronic[] EMPTY_ELECTRONIC_LIST = {};
+
+    private static Electronic[] electronicList;
+    private static Electronics electronicsInstance;
+
+    private int size;
+    private int capacity;
+
+    Electronics(){
+        electronicList = EMPTY_ELECTRONIC_LIST;
+    }
+
+    // TODO: 1. Electronics 클래스의 객체를 싱글톤으로 생성하는 함수를 작성하시오.
+    public static Electronics getInstance() {
+        if (electronicsInstance == null) electronicsInstance = new Electronics();
+        return electronicsInstance;
+    }
+
+    // TODO: 2. 전자제품 일련번호 productNo를 통해 인자로 주어진 일련번호에 해당하는 전자제품을 반환하는 함수를 작성하시오.
+    public Optional<Electronic> findByProductNo(String productNo){
+        for (Electronic electronic : electronicList)
+            if (productNo.equals(electronic.getProductNo()))
+                return Optional.of(electronic);
+
+        return Optional.empty();
+    }
+
+    // TODO: 3. 전자제품들 중 인자로 주어진 제조 회사를 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
+    public Optional<Electronic[]> groupByCompanyName(CompanyName company){
+
+        List<Electronic> temp = new ArrayList<>();
+
+        for (Electronic electronic : electronicList)
+            // 테스트용 임시 조건 ( electronic != null )
+            if (electronic != null && electronic.getCompanyName().equals(company))
+                temp.add(electronic);
+
+        Electronic[] companyNameGroup =
+                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
+
+        return Optional.ofNullable(companyNameGroup);
+    }
+
+    public Optional<Electronic> findByCompanyName(CompanyName company){
+        for (Electronic electronic : electronicList)
+            if (company.equals(electronic.getCompanyName()))
+                return Optional.of(electronic);
+
+        return Optional.empty();
+    }
+
+    // TODO: 4. 전자제품들 중 인자로 주어진 인증 방법을 찾아서 하나의 배열에 반환하는 함수를 작성하시오.
+    public Optional<Electronic[]> groupByAuthMethod(AuthMethod authMethod){
+
+        List<Electronic> temp = new ArrayList<>();
+
+        for (Electronic electronic : electronicList)
+            // 테스트용 임시 조건 ( electronic != null )
+            if (electronic != null && electronic.isContainAuthMethod(authMethod))
+                temp.add(electronic);
+
+        Electronic[] authMethodNameGroup =
+                temp.isEmpty() ? null : ElectronicArrayUtil.listToArray(temp);
+
+        return Optional.ofNullable(authMethodNameGroup);
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public void setCapacity(int capacity) {
+        this.capacity = capacity;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(Arrays.hashCode(electronicList), size, capacity);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        return Objects.equals(hashCode(), ((Electronics)obj).hashCode());
+    }
+
+    @Override
+    public String toString() {
+        return "Users { " +
+                "size=" + size +
+                ", capacity=" + capacity +
+                ", electronicList= " + Arrays.toString(electronicList) + " }";
+    }
+
+    //==================================== TEST CODE ====================================//
+    public void add (Electronic electronic) {
+        if (electronicList == EMPTY_ELECTRONIC_LIST)
+            electronicList = new Electronic[DEFAULT_CAPACITY];
+        /* 배열 크기 체크하고 늘리는 로직 구현 할 것 */
+        electronicList[size++] = electronic;
+    }
+
+    public static void main(String[] args) {
+        Electronic iPhone13 = new Electronic("아이폰13", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
+        Electronic iPhone12 = new Electronic("아이폰12", CompanyName.APPLE, new AuthMethod[]{AuthMethod.FACE, AuthMethod.PIN, AuthMethod.PATTERN});
+        Electronic galaxyS22 = new Electronic("갤럭시S22", CompanyName.SAMSUNG, new AuthMethod[]{AuthMethod.FINGERPRINT, AuthMethod.PIN, AuthMethod.PATTERN});
+
+        Electronics electronics = getInstance();
+        electronics.add(iPhone13);
+        electronics.add(iPhone12);
+        electronics.add(galaxyS22);
+
+//        System.out.println(electronics);
+
+        Optional<Electronic[]> authMethodGroupPIN = electronics.groupByAuthMethod(AuthMethod.FACE);
+        authMethodGroupPIN.ifPresent(value -> System.out.println(Arrays.toString(value)));
+
+        Optional<Electronic[]> companyNameGroupAPPLE = electronics.groupByCompanyName(CompanyName.SAMSUNG);
+        companyNameGroupAPPLE.ifPresent(value -> System.out.println(Arrays.toString(value)));
+    }
+}