java achieve deep copy of two ways, writing inaccuracies also please correct me great God
1. Serializing way deep copy;
2. cloned sequentially embodiment each variable domain realization reference type;
code show as below:
Teacher first constructed class that implements the interface, clone method implemented using the sequence of:
class Teacher implements Cloneable,Serializable{
/**
*
*/
private static final long serialVersionUID = 4390576177500173601L;
public String name;
public String phone;
public Teacher(String name, String phone) {
this.name = name;
this.phone = phone;
}
@Override
protected Object clone() {
Teacher t = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream b= null;
try {
b = new ObjectOutputStream(baos);
b.writeObject(this);
} catch (IOException e) {
e.printStackTrace ();
}finally{
try {
b.close();
} catch (IOException e) {
e.printStackTrace ();
}
}
ByteArrayInputStream bi = new ByteArrayInputStream(baos.toByteArray());
try {
ObjectInputStream oi = new ObjectInputStream(bi);
t = (Teacher) oi.readObject();
oi.close();
bi.close();
} catch (IOException e) {
e.printStackTrace ();
} catch (ClassNotFoundException e) {
e.printStackTrace ();
}
return t;
}
}
Construction Worker class, implemented method of cloning reference
class Worker implements Cloneable{
public String name;
public String phone;
public Worker(String name, String phone) {
this.name = name;
this.phone = phone;
}
@Override
protected Worker clone(){
Worker worker = null;
try {
worker = (Worker) super.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace ();
}
return worker;
}
}
}
Write Test:
public class CloneCompare {
public static void main(String[] args) {
Worker w = new Worker("lisi", "123");
Teacher t = new Teacher("wangwu", "123123");
long time1 = System.currentTimeMillis();
for(int a=0;a<10000;a++){
w.clone();
}
System.out.println(System.currentTimeMillis()-time1);
long time2 = System.currentTimeMillis();
for(int a=0;a<10000;a++){
t.clone();
}
System.out.println(System.currentTimeMillis()-time2);
}
}
Test results are as follows:
3
615
Efficiency difference is already 200 times, in fact, the internal class type of application is not a lot of cases, a simple clone of the lead is the best choice.
