简单的区分一下深复制和浅复制,在java中只需要实现一下Cloneable接口,重写clone()就可以做到深复制.
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| package prototype;
import java.util.Calendar;
public class WorkExperience implements Cloneable {
private String company;
private Calendar start;
private Calendar end;
@Override
protected Object clone() throws CloneNotSupportedException {
WorkExperience copy = new WorkExperience(company, start, end);
return copy;
}
@Override
public String toString() {
return "{" +
"company='" + company + '\'' +
", start=" + start.getTimeInMillis() +
", end=" + end.getTimeInMillis() +
'}';
}
public WorkExperience(String company, Calendar start, Calendar end) {
this.company = company;
this.start = start;
this.end = end;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public Calendar getStart() {
return start;
}
public void setStart(Calendar start) {
this.start = start;
}
public Calendar getEnd() {
return end;
}
public void setEnd(Calendar end) {
this.end = end;
}
}
|
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| package prototype;
public class Resume implements Cloneable {
private String name;
private int age;
private WorkExperience workExperience;
@Override
protected Object clone() throws CloneNotSupportedException {
Resume copy = new Resume(name, age);
copy.setWorkExperience((WorkExperience) this.workExperience.clone());
return copy;
}
@Override
public String toString() {
return "Resume{" +
"name='" + name + '\'' +
", age=" + age +
", workExperience=" + workExperience +
'}';
}
public Resume(String name, int age) {
this.name = name;
this.age = 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 WorkExperience getWorkExperience() {
return workExperience;
}
public void setWorkExperience(WorkExperience workExperience) {
this.workExperience = workExperience;
}
}
|
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| package prototype;
import java.util.Calendar;
public class Main {
public static void main(String[] args) throws CloneNotSupportedException {
Resume r1 = new Resume("jack", 19);
r1.setWorkExperience(new WorkExperience("google", Calendar.getInstance(), Calendar.getInstance()));
System.out.println("r1: " + r1);
Resume r2 = (Resume) r1.clone();
r2.setName("lucy");
r2.getWorkExperience().setCompany("facebook");
Calendar yesterday = Calendar.getInstance();
yesterday.add(Calendar.DATE, -1);
r2.getWorkExperience().setEnd(yesterday);
System.out.println("r2: " + r2);
}
}
|
