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集合类属性深克隆与浅克隆测试

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F嘉阳
2018-09-25 23:11:50 +08:00
parent 02e0e79bdf
commit 4b26f4641e
4 changed files with 159 additions and 0 deletions
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5
src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/CMailAfter.java
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@@ -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
*/

43
src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneAfter.java Normal file
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@@ -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;
}
}

33
src/main/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneBefore.java Normal file
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@@ -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();
}
}

78
src/test/java/top/fjy8018/designpattern/pattern/creational/prototype/clone/ListCloneBeforeTest.java Normal file
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@@ -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);
}
}