一、ArrayList的Clone方法的源码
- 返回一个Object对象，所以在使用此方法的时候要强制转换。
- ArrayList的本质是维护了一个Object的数组，所以克隆也是通过数组的复制实现的，属于浅复制。
public Object clone() {
try {
@SuppressWarnings("unchecked")
ArrayList<E> v = (ArrayList<E>) super.clone();
v.elementData = Arrays.copyOf(elementData, size);
v.modCount = 0;
return v;
} catch (CloneNotSupportedException e) {
// this shouldn't happen, since we are Cloneable
throw new InternalError();
}
}
二、ArrayList的Clone浅复制的巧妙使用
当你需要使用remove方法移除掉集合中的对象，而非要修改集合中的对象的时候，可以选择使用。
//添加两个元素
Student stJack=new Student("Jack", 13);
Student stTom=new Student("Tom", 15);
list.add(stJack);
list.add(stTom);
//克隆
ArrayList<Student> listCopy=(ArrayList<Student>) list.clone();
//移除且不修改
listCopy.remove(1);
System.out.println(list);
System.out.println(listCopy);
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代码解读：
remove之前的：
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" alt="" />
remove之后的：
aaarticlea/png;base64,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" alt="" />
所以移除且不修改集合中的元素，只是在List内部的数组中移除了指向元素的地址，可以放心的使用clone。
三、实现List的深复制
如果你想要修改克隆后的集合，那么克隆前的也会被修改。那么就需要使用深复制。通过实现对象类的clone方法。
public class testClone {
public static void main(String[] args) {
ArrayList<Student> list=new ArrayList<Student>();
//添加两个元素
Student stJack=new Student("Jack", 13);
Student stTom=new Student("Tom", 15);
list.add(stJack);
list.add(stTom);
//深克隆
ArrayList<Student> listCopy=new ArrayList<Student>();
for (Student student : list) {
listCopy.add(student.clone());
}
//移除且不修改
listCopy.get(0).setAge(20);
System.out.println(list);
System.out.println(listCopy);
}
}
class Student{
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + "]";
}
@Override
protected Student clone(){
Student stuent = new Student(this.name,this.age);
return stuent;
}
}