User user = newUser("大山", address);// 调用构造函数时进行深拷贝User copyUser = newUser(user.getName(), newAddress(address.getCity(),address.getCountry()));// 修改源对象的值user.getAddress().setCity("深圳");// 检查两个对象的值不同assertNotSame(user.getAddress().getCity(), copyUse...
JAVA最快的DEEPCOPY OBJECT java加快编译速度 虚拟机最开始是通过解释器进行解释执行的,解释器是最基础的,但是没有优化,效率和速度都有待提高。但是只依靠解释器不进行优化也是可以的。即时编译器和提前编译器都是采取的优化措施,是可选择的。 即时编译器:当虚拟机发现某个方法或代码块的运行特别频繁,就会把这些代码认...
下面是一个浅拷贝的示例代码: publicclassPersonimplementsCloneable{privateStringname;privateintage;privateList<String>hobbies;publicPerson(Stringname,intage,List<String>hobbies){this.name=name;this.age=age;this.hobbies=hobbies;}@OverridepublicObjectclone()throwsCloneNotSupportedException{returnsuper.clone();}}...
Person person1Copy=person1.clone(); // true System.out.println(person1.getAddress()==person1Copy.getAddress()); 从输出结构就可以看出, person1 的克隆对象和 person1 使用的仍然是同一个 Address 对象。 深拷贝 这里我们简单对 Person 类的 clone() 方法进行修改,连带着要把 Person 对象内部的 Addre...
I am having some troubles of copying an object to a new object. Initially I tried this: StateclonedState=state; But then I noticed that the changes I make in "clonedState" affects "state" as well. So then I went to search, and found out about deep cloning. Some people suggested using...
I want to make a deep copy of an object array using a constructor. public class PositionList { private Position[] data = new Position[0]; public PositionList(PositionList other, boolean deepCopy) { if (deepCopy){ size=other.getSize(); data=new Position[other.data.length]; for (int ...
1. 写在前面 今天遇到了这样一个问题,事实上这个问题是之前遇到过的。java 中列表的赋值的问题。这个问题核心是 deep copy & shallow copy 的问题 ...
protected Object clone() throws CloneNotSupportedException { return super.clone(); } // 深拷贝实现 public ShoppingList deepCopy() { return new ShoppingList(this.itemCount, new Fruit(this.fruitBasket)); } } public class DeepCopyVsShallowCopy { ...
Deep copy HashMap HashMap<Integer,Integer>map=newHashMap<>();HashMap<Integer,Integer>map2=newHashMap<>();map2.putAll(map); or HashMap<Integer,Integer>map=newHashMap<>();HashMap<Integer,Integer>map2=newHashMap<>(map); Anyway, Good luck, Richardo! -- 09/27/2016...
用输入输出流做该对象的deep copy。这里以一个DAG(Directed Acyclic Graph)对象为例,代码如下: public DirectedAcyclicGraphdeepCopy(){try{ByteArrayOutputStream baos=newByteArrayOutputStream();ObjectOutputStream oos=newObjectOutputStream(baos);oos.writeObject(this);ByteArrayInputStream bais=newByteArrayInputStr...