集合类属性深克隆与浅克隆测试

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/CMailAfter.java

@@ -3,7 +3,9 @@ package top.fjy8018.designpattern.pattern.creational.prototype.clone;
 import lombok.Getter;
 import lombok.Setter;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.ibatis.cache.CacheKey;
 
+import java.util.ArrayList;
 import java.util.Date;
 
 /**
@@ -12,6 +14,9 @@ import java.util.Date;
  * <p>
  * 邮件——深克隆实现
  *
+ * JDK源码样例：{@link ArrayList#clone()} 通过元素拷贝实现
+ * mybatis源码样例：{@link CacheKey#clone()} 通过重新初始化一个对象再进行数组拷贝实现
+ *
  * @author F嘉阳
  * @date 2018-09-25 20:39
  */

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneAfter.java

@@ -0,0 +1,43 @@
+package top.fjy8018.designpattern.pattern.creational.prototype.clone;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.apache.ibatis.cache.CacheKey;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * 对集合类原型模式实现
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 22:59
+ */
+@Getter
+@Setter
+public class ListCloneAfter implements Cloneable {
+    private String name;
+    private List<Date> dateList;
+
+    @Override
+    public String toString() {
+        return "ListCloneBefore{" +
+                "name='" + name + '\'' +
+                ", dateList=" + dateList +
+                '}';
+    }
+
+    /**
+     * 重新实现集合类属性值拷贝方法，模仿{@link CacheKey#clone()}
+     *
+     * @return
+     * @throws CloneNotSupportedException
+     */
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        ListCloneAfter newInstance = (ListCloneAfter) super.clone();
+        newInstance.setDateList(new ArrayList<>(this.dateList));
+        return newInstance;
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneBefore.java

@@ -0,0 +1,33 @@
+package top.fjy8018.designpattern.pattern.creational.prototype.clone;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Date;
+import java.util.List;
+
+/**
+ * 对集合类原型模式实现
+ *
+ * @author F嘉阳
+ * @date 2018-09-25 22:59
+ */
+@Getter
+@Setter
+public class ListCloneBefore implements Cloneable {
+    private String name;
+    private List<Date> dateList;
+
+    @Override
+    public String toString() {
+        return "ListCloneBefore{" +
+                "name='" + name + '\'' +
+                ", dateList=" + dateList +
+                '}';
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+}

src/test/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneBeforeTest.java

@@ -0,0 +1,78 @@
+package top.fjy8018.designpattern.pattern.creational.prototype.clone;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+@Slf4j
+class ListCloneBeforeTest {
+
+    /**
+     * 由输出可知，集合类属性值传递的也是引用
+     * output
+     * ===
+     * 7f13d6e ListCloneBefore{name='初始', dateList=[Thu Jan 01 08:00:00 CST 1970, Tue Sep 25 23:05:17 CST 2018]}
+     * 1e965684 ListCloneBefore{name='初始', dateList=[Thu Jan 01 08:00:00 CST 1970, Tue Sep 25 23:05:17 CST 2018]}
+     * 7f13d6e ListCloneBefore{name='初始', dateList=[Tue Sep 25 23:05:17 CST 2018]}
+     * 1e965684 ListCloneBefore{name='初始', dateList=[Tue Sep 25 23:05:17 CST 2018]}
+     * ===
+     *
+     * @throws Exception
+     */
+    @Test
+    void cloneBefore() throws Exception {
+        List<Date> dates = new ArrayList<>();
+        dates.add(new Date(0L));
+        dates.add(new Date());
+
+        ListCloneBefore before = new ListCloneBefore();
+        before.setName("初始");
+        before.setDateList(dates);
+        ListCloneBefore after = (ListCloneBefore) before.clone();
+
+        log.info(Integer.toHexString(before.hashCode()) + " " + before);
+        log.info(Integer.toHexString(after.hashCode()) + " " + after);
+
+        dates.remove(0);
+        before.setDateList(dates);
+
+        log.info(Integer.toHexString(before.hashCode()) + " " + before);
+        log.info(Integer.toHexString(after.hashCode()) + " " + after);
+    }
+
+    /**
+     * 改造后输出符合预期
+     * output
+     * ===
+     * 7f13d6e ListCloneBefore{name='初始', dateList=[Thu Jan 01 08:00:00 CST 1970, Tue Sep 25 23:10:32 CST 2018]}
+     * 1e965684 ListCloneBefore{name='初始', dateList=[Thu Jan 01 08:00:00 CST 1970, Tue Sep 25 23:10:32 CST 2018]}
+     * 7f13d6e ListCloneBefore{name='初始', dateList=[Tue Sep 25 23:10:32 CST 2018]}
+     * 1e965684 ListCloneBefore{name='初始', dateList=[Thu Jan 01 08:00:00 CST 1970, Tue Sep 25 23:10:32 CST 2018]}
+     * ===
+     *
+     * @throws Exception
+     */
+    @Test
+    void cloneAfter() throws Exception {
+        List<Date> dates = new ArrayList<>();
+        dates.add(new Date(0L));
+        dates.add(new Date());
+
+        ListCloneAfter before = new ListCloneAfter();
+        before.setName("初始");
+        before.setDateList(dates);
+        ListCloneAfter after = (ListCloneAfter) before.clone();
+
+        log.info(Integer.toHexString(before.hashCode()) + " " + before);
+        log.info(Integer.toHexString(after.hashCode()) + " " + after);
+
+        dates.remove(0);
+        before.setDateList(dates);
+
+        log.info(Integer.toHexString(before.hashCode()) + " " + before);
+        log.info(Integer.toHexString(after.hashCode()) + " " + after);
+    }
+}