小傅哥 | 重学 Java 设计模式：实战原型模式

.gitignore

@@ -6,3 +6,6 @@
 /itstack-demo-design-3-01/itstack-demo-design-3-01.iml
 /itstack-demo-design-3-02/itstack-demo-design-3-02.iml
 /itstack-demo-design-3-00/itstack-demo-design-3-00.iml
+/itstack-demo-desgin-4-01/itstack-demo-desgin-4-01.iml
+/itstack-demo-design-4-02/itstack-demo-design-4-02.iml
+/itstack-demo-design-4-00/itstack-demo-design-4-00.iml

README.md

-# itstack-demo-design
-设计模式案例
+# 重学 Java 设计模式
+
+- [`重学 Java 设计模式：实战工厂方法模式`](https://bugstack.cn/itstack-demo-design/2020/05/20/%E9%87%8D%E5%AD%A6Java%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-%E5%AE%9E%E6%88%98%E5%B7%A5%E5%8E%82%E6%96%B9%E6%B3%95%E6%A8%A1%E5%BC%8F.html)
+- [`重学 Java 设计模式：实战抽象工厂模式`](https://bugstack.cn/itstack-demo-design/2020/05/24/%E9%87%8D%E5%AD%A6Java%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-%E6%8A%BD%E8%B1%A1%E5%B7%A5%E5%8E%82%E6%A8%A1%E5%BC%8F.html)
+- [`重学 Java 设计模式：实战建造者模式`](https://bugstack.cn/itstack-demo-design/2020/05/26/%E9%87%8D%E5%AD%A6Java%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-%E5%AE%9E%E6%88%98%E5%BB%BA%E9%80%A0%E8%80%85%E6%A8%A1%E5%BC%8F.html)
+- [`重学 Java 设计模式：实战原型模式`](https://bugstack.cn/itstack-demo-design/2020/05/28/%E9%87%8D%E5%AD%A6-Java-%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F-%E5%AE%9E%E6%88%98%E5%8E%9F%E5%9E%8B%E6%A8%A1%E5%BC%8F.html)
+

itstack-demo-desgin-4-01/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>itstack-demo-design</artifactId>
+        <groupId>org.itstack</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>itstack-demo-desgin-4-01</artifactId>
+
+
+</project>
\ No newline at end of file

itstack-demo-desgin-4-01/src/main/java/org/itstack/demo/design/QuestionBankController.java

+package org.itstack.demo.design;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class QuestionBankController {
+
+    public String createPaper(String candidate, String number) {
+
+        List<ChoiceQuestion> choiceQuestionList = new ArrayList<ChoiceQuestion>();
+        List<AnswerQuestion> answerQuestionList = new ArrayList<AnswerQuestion>();
+
+        Map<String, String> map01 = new HashMap<String, String>();
+        map01.put("A", "JAVA2 EE");
+        map01.put("B", "JAVA2 Card");
+        map01.put("C", "JAVA2 ME");
+        map01.put("D", "JAVA2 HE");
+        map01.put("E", "JAVA2 SE");
+
+        Map<String, String> map02 = new HashMap<String, String>();
+        map02.put("A", "JAVA程序的main方法必须写在类里面");
+        map02.put("B", "JAVA程序中可以有多个main方法");
+        map02.put("C", "JAVA程序中类名必须与文件名一样");
+        map02.put("D", "JAVA程序的main方法中如果只有一条语句，可以不用{}(大括号)括起来");
+
+        Map<String, String> map03 = new HashMap<String, String>();
+        map03.put("A", "变量由字母、下划线、数字、$符号随意组成；");
+        map03.put("B", "变量不能以数字作为开头；");
+        map03.put("C", "A和a在java中是同一个变量；");
+        map03.put("D", "不同类型的变量，可以起相同的名字；");
+
+        Map<String, String> map04 = new HashMap<String, String>();
+        map04.put("A", "STRING");
+        map04.put("B", "x3x;");
+        map04.put("C", "void");
+        map04.put("D", "de$f");
+
+        Map<String, String> map05 = new HashMap<String, String>();
+        map05.put("A", "31");
+        map05.put("B", "0");
+        map05.put("C", "1");
+        map05.put("D", "2");
+
+        choiceQuestionList.add(new ChoiceQuestion("JAVA所定义的版本中不包括", map01, "D"));
+        choiceQuestionList.add(new ChoiceQuestion("下列说法正确的是", map02, "A"));
+        choiceQuestionList.add(new ChoiceQuestion("变量命名规范说法正确的是", map03, "B"));
+        choiceQuestionList.add(new ChoiceQuestion("以下()不是合法的标识符", map04, "C"));
+        choiceQuestionList.add(new ChoiceQuestion("表达式(11+3*8)/4%3的值是", map05, "D"));
+        answerQuestionList.add(new AnswerQuestion("小红马和小黑马生的小马几条腿", "4条腿"));
+        answerQuestionList.add(new AnswerQuestion("铁棒打头疼还是木棒打头疼", "头最疼"));
+        answerQuestionList.add(new AnswerQuestion("什么床不能睡觉", "牙床"));
+        answerQuestionList.add(new AnswerQuestion("为什么好马不吃回头草", "后面的草没了"));
+
+        // 输出结果
+        StringBuilder detail = new StringBuilder("考生：" + candidate + "\r\n" +
+                "考号：" + number + "\r\n" +
+                "--------------------------------------------\r\n" +
+                "一、选择题" + "\r\n\n");
+
+        for (int idx = 0; idx < choiceQuestionList.size(); idx++) {
+            detail.append("第").append(idx + 1).append("题：").append(choiceQuestionList.get(idx).getName()).append("\r\n");
+            Map<String, String> option = choiceQuestionList.get(idx).getOption();
+            for (String key : option.keySet()) {
+                detail.append(key).append("：").append(option.get(key)).append("\r\n");
+                ;
+            }
+            detail.append("答案：").append(choiceQuestionList.get(idx).getKey()).append("\r\n\n");
+        }
+
+        detail.append("二、问答题" + "\r\n\n");
+
+        for (int idx = 0; idx < answerQuestionList.size(); idx++) {
+            detail.append("第").append(idx + 1).append("题：").append(answerQuestionList.get(idx).getName()).append("\r\n");
+            detail.append("答案：").append(answerQuestionList.get(idx).getKey()).append("\r\n\n");
+        }
+
+        return detail.toString();
+    }
+
+}

itstack-demo-desgin-4-01/src/test/java/org/itstack/demo/desgin/test/ApiTest.java

+package org.itstack.demo.desgin.test;
+
+import org.itstack.demo.design.QuestionBankController;
+import org.junit.Test;
+
+public class ApiTest {
+
+    @Test
+    public void test_QuestionBankController() {
+        QuestionBankController questionBankController = new QuestionBankController();
+        System.out.println(questionBankController.createPaper("花花", "1000001921032"));
+        System.out.println(questionBankController.createPaper("豆豆", "1000001921051"));
+        System.out.println(questionBankController.createPaper("大宝", "1000001921987"));
+    }
+
+}

itstack-demo-design-4-00/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>itstack-demo-design</artifactId>
+        <groupId>org.itstack</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>itstack-demo-design-4-00</artifactId>
+
+
+</project>
\ No newline at end of file

itstack-demo-design-4-00/src/main/java/org/itstack/demo/design/AnswerQuestion.java

+package org.itstack.demo.design;
+
+/**
+ * 解答题
+ */
+public class AnswerQuestion {
+
+    private String name;  // 问题
+    private String key;   // 答案
+
+    public AnswerQuestion() {
+    }
+
+    public AnswerQuestion(String name, String key) {
+        this.name = name;
+        this.key = key;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+}

itstack-demo-design-4-00/src/main/java/org/itstack/demo/design/ChoiceQuestion.java

+package org.itstack.demo.design;
+
+import java.util.Map;
+
+/**
+ * 单选题
+ */
+public class ChoiceQuestion {
+
+    private String name;                 // 题目
+    private Map<String, String> option;  // 选项；A、B、C、D
+    private String key;                  // 答案；B
+
+    public ChoiceQuestion() {
+    }
+
+    public ChoiceQuestion(String name, Map<String, String> option, String key) {
+        this.name = name;
+        this.option = option;
+        this.key = key;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Map<String, String> getOption() {
+        return option;
+    }
+
+    public void setOption(Map<String, String> option) {
+        this.option = option;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+}

itstack-demo-design-4-00/src/test/java/org/itstack/demo/design/test/ApiTest.java

+package org.itstack.demo.design.test;
+
+import com.alibaba.fastjson.JSON;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+
+public class ApiTest {
+
+    @Test
+    public void test_clone() throws CloneNotSupportedException {
+        ArrayList<String> l01 = new ArrayList<String>();
+        l01.add("xxx");
+        l01.add("yyy");
+
+        ArrayList<String> l02 = (ArrayList<String>) l01.clone();
+        l02.add("zzz");
+
+        System.out.println(JSON.toJSONString(l01));
+        System.out.println(JSON.toJSONString(l02));
+
+        l01.remove("xxx");
+
+        System.out.println(JSON.toJSONString(l01));
+        System.out.println(JSON.toJSONString(l02));
+    }
+
+}

itstack-demo-design-4-02/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>itstack-demo-design</artifactId>
+        <groupId>org.itstack</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>itstack-demo-design-4-02</artifactId>
+    <dependencies>
+        <dependency>
+            <groupId>org.itstack</groupId>
+            <artifactId>itstack-demo-design-4-00</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+
+</project>
\ No newline at end of file

itstack-demo-design-4-02/src/main/java/org/itstack/demo/design/QuestionBank.java

+package org.itstack.demo.design;
+
+import org.itstack.demo.design.util.Topic;
+import org.itstack.demo.design.util.TopicRandomUtil;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Map;
+
+public class QuestionBank implements Cloneable {
+
+    private String candidate; // 考生
+    private String number;    // 考号
+
+    private ArrayList<ChoiceQuestion> choiceQuestionList = new ArrayList<ChoiceQuestion>();
+    private ArrayList<AnswerQuestion> answerQuestionList = new ArrayList<AnswerQuestion>();
+
+    public QuestionBank append(ChoiceQuestion choiceQuestion) {
+        choiceQuestionList.add(choiceQuestion);
+        return this;
+    }
+
+    public QuestionBank append(AnswerQuestion answerQuestion) {
+        answerQuestionList.add(answerQuestion);
+        return this;
+    }
+
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        QuestionBank questionBank = (QuestionBank) super.clone();
+        questionBank.choiceQuestionList = (ArrayList<ChoiceQuestion>) choiceQuestionList.clone();
+        questionBank.answerQuestionList = (ArrayList<AnswerQuestion>) answerQuestionList.clone();
+
+        // 题目乱序
+        Collections.shuffle(questionBank.choiceQuestionList);
+        Collections.shuffle(questionBank.answerQuestionList);
+        // 答案乱序
+        ArrayList<ChoiceQuestion> choiceQuestionList = questionBank.choiceQuestionList;
+        for (ChoiceQuestion question : choiceQuestionList) {
+            Topic random = TopicRandomUtil.random(question.getOption(), question.getKey());
+            question.setOption(random.getOption());
+            question.setKey(random.getKey());
+        }
+        return questionBank;
+    }
+
+    public void setCandidate(String candidate) {
+        this.candidate = candidate;
+    }
+
+    public void setNumber(String number) {
+        this.number = number;
+    }
+
+    @Override
+    public String toString() {
+
+        StringBuilder detail = new StringBuilder("考生：" + candidate + "\r\n" +
+                "考号：" + number + "\r\n" +
+                "--------------------------------------------\r\n" +
+                "一、选择题" + "\r\n\n");
+
+        for (int idx = 0; idx < choiceQuestionList.size(); idx++) {
+            detail.append("第").append(idx + 1).append("题：").append(choiceQuestionList.get(idx).getName()).append("\r\n");
+            Map<String, String> option = choiceQuestionList.get(idx).getOption();
+            for (String key : option.keySet()) {
+                detail.append(key).append("：").append(option.get(key)).append("\r\n");;
+            }
+            detail.append("答案：").append(choiceQuestionList.get(idx).getKey()).append("\r\n\n");
+        }
+
+        detail.append("二、问答题" + "\r\n\n");
+
+        for (int idx = 0; idx < answerQuestionList.size(); idx++) {
+            detail.append("第").append(idx + 1).append("题：").append(answerQuestionList.get(idx).getName()).append("\r\n");
+            detail.append("答案：").append(answerQuestionList.get(idx).getKey()).append("\r\n\n");
+        }
+
+        return detail.toString();
+    }
+
+}

itstack-demo-design-4-02/src/main/java/org/itstack/demo/design/QuestionBankController.java

+package org.itstack.demo.design;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class QuestionBankController {
+
+    private QuestionBank questionBank = new QuestionBank();
+
+    public QuestionBankController() {
+
+        Map<String, String> map01 = new HashMap<String, String>();
+        map01.put("A", "JAVA2 EE");
+        map01.put("B", "JAVA2 Card");
+        map01.put("C", "JAVA2 ME");
+        map01.put("D", "JAVA2 HE");
+        map01.put("E", "JAVA2 SE");
+
+        Map<String, String> map02 = new HashMap<String, String>();
+        map02.put("A", "JAVA程序的main方法必须写在类里面");
+        map02.put("B", "JAVA程序中可以有多个main方法");
+        map02.put("C", "JAVA程序中类名必须与文件名一样");
+        map02.put("D", "JAVA程序的main方法中如果只有一条语句，可以不用{}(大括号)括起来");
+
+        Map<String, String> map03 = new HashMap<String, String>();
+        map03.put("A", "变量由字母、下划线、数字、$符号随意组成；");
+        map03.put("B", "变量不能以数字作为开头；");
+        map03.put("C", "A和a在java中是同一个变量；");
+        map03.put("D", "不同类型的变量，可以起相同的名字；");
+
+        Map<String, String> map04 = new HashMap<String, String>();
+        map04.put("A", "STRING");
+        map04.put("B", "x3x;");
+        map04.put("C", "void");
+        map04.put("D", "de$f");
+
+        Map<String, String> map05 = new HashMap<String, String>();
+        map05.put("A", "31");
+        map05.put("B", "0");
+        map05.put("C", "1");
+        map05.put("D", "2");
+
+        questionBank.append(new ChoiceQuestion("JAVA所定义的版本中不包括", map01, "D"))
+                .append(new ChoiceQuestion("下列说法正确的是", map02, "A"))
+                .append(new ChoiceQuestion("变量命名规范说法正确的是", map03, "B"))
+                .append(new ChoiceQuestion("以下()不是合法的标识符",map04, "C"))
+                .append(new ChoiceQuestion("表达式(11+3*8)/4%3的值是", map05, "D"))
+                .append(new AnswerQuestion("小红马和小黑马生的小马几条腿", "4条腿"))
+                .append(new AnswerQuestion("铁棒打头疼还是木棒打头疼", "头最疼"))
+                .append(new AnswerQuestion("什么床不能睡觉", "牙床"))
+                .append(new AnswerQuestion("为什么好马不吃回头草", "后面的草没了"));
+    }
+
+    public String createPaper(String candidate, String number) throws CloneNotSupportedException {
+        QuestionBank questionBankClone = (QuestionBank) questionBank.clone();
+        questionBankClone.setCandidate(candidate);
+        questionBankClone.setNumber(number);
+        return questionBankClone.toString();
+    }
+
+}

itstack-demo-design-4-02/src/main/java/org/itstack/demo/design/util/Topic.java

+package org.itstack.demo.design.util;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class Topic {
+
+    private Map<String, String> option;  // 选项；A、B、C、D
+    private String key;           // 答案；B
+
+    public Topic() {
+    }
+
+    public Topic(Map<String, String> option, String key) {
+        this.option = option;
+        this.key = key;
+    }
+
+    public Map<String, String> getOption() {
+        return option;
+    }
+
+    public void setOption(Map<String, String> option) {
+        this.option = option;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+}

itstack-demo-design-4-02/src/main/java/org/itstack/demo/design/util/TopicRandomUtil.java

+package org.itstack.demo.design.util;
+
+import java.util.*;
+
+public class TopicRandomUtil {
+
+    /**
+     * 乱序Map元素，记录对应答案key
+     * @param option 题目
+     * @param key    答案
+     * @return Topic 乱序后 {A=c., B=d., C=a., D=b.}
+     */
+    static public Topic random(Map<String, String> option, String key) {
+        Set<String> keySet = option.keySet();
+        ArrayList<String> keyList = new ArrayList<String>(keySet);
+        Collections.shuffle(keyList);
+        HashMap<String, String> optionNew = new HashMap<String, String>();
+        int idx = 0;
+        String keyNew = "";
+        for (String next : keySet) {
+            String randomKey = keyList.get(idx++);
+            if (key.equals(next)) {
+                keyNew = randomKey;
+            }
+            optionNew.put(randomKey, option.get(next));
+        }
+        return new Topic(optionNew, keyNew);
+    }
+
+}

itstack-demo-design-4-02/src/test/java/org/itstack/demo/desgin/test/ApiTest.java

+package org.itstack.demo.desgin.test;
+
+import org.itstack.demo.design.QuestionBankController;
+import org.junit.Test;
+
+public class ApiTest {
+
+    @Test
+    public void test_QuestionBank() throws CloneNotSupportedException {
+        QuestionBankController questionBankController = new QuestionBankController();
+        System.out.println(questionBankController.createPaper("花花", "1000001921032"));
+        System.out.println(questionBankController.createPaper("豆豆", "1000001921051"));
+        System.out.println(questionBankController.createPaper("大宝", "1000001921987"));
+    }
+
+}

pom.xml

@@ -18,6 +18,9 @@
         <module>itstack-demo-design-3-00</module>
         <module>itstack-demo-design-3-01</module>
         <module>itstack-demo-design-3-02</module>
+        <module>itstack-demo-design-4-00</module>
+        <module>itstack-demo-desgin-4-01</module>
+        <module>itstack-demo-design-4-02</module>
     </modules>
 
     <dependencies>