Java基础 深拷贝浅拷贝
-
非基本数据类型 需要new新空间
```
class Student implements Cloneable{
private int id;
private String name;
private Vector course;public Student(){
try{
Thread.sleep(1000);
System.out.println("Student Constructor called.");
}catch (InterruptedException e){
e.printStackTrace();
}
}public String getName() {return name;}
public void setName(String name) {this.name = name;}public int getId() {return id;}
public void setId(int id) {this.id = id;}public Vector getCourse() {return course;}
public void setCourse(Vector course) {this.course = course;}//浅拷贝
public Student newInstance(){
try{
return (Student)this.clone();
}catch (CloneNotSupportedException e){
e.printStackTrace();
}
return null;
}//深拷贝
public Student deepClone(){
try{
Student cloning = (Student) super.clone();
cloning.course = new Vector();
return cloning;}catch (CloneNotSupportedException e){
e.printStackTrace();
}
return null;}
}
public Object clone(){ //覆写clone()，深拷贝
try{
Student cloning = (Student) super.clone();
// 这里不能使用Student cloning = (Student) this.clone()的原因:
正在覆写本类的clone()方法，如果再调用本类的函数，即：this.clone()，就相当于无限递归无限死循环了，最终会崩溃的。所以这里：super.clone()。
cloning.courses = new Vector(); //关键点：非基本数据类型的空间需要自己新开辟一块儿
return cloning;
}catch(CloneNotSupportedException e){
e.printStackTrace();
}
return null; }
```