Shallow Copy Test : Clone « Class « Java
- Java
- Class
- Clone
Shallow Copy Test
/*
Software Architecture Design Patterns in Java
by Partha Kuchana
Auerbach Publications
*/
class Person implements Cloneable {
//Lower-level object
private Car car;
private String name;
public Car getCar() {
return car;
}
public String getName() {
return name;
}
public void setName(String s) {
name = s;
}
public Person(String s, String t) {
name = s;
car = new Car(t);
}
public Object clone() {
//shallow copy
try {
return super.clone();
} catch (CloneNotSupportedException e) {
return null;
}
}
}
class Car {
private String name;
public String getName() {
return name;
}
public void setName(String s) {
name = s;
}
public Car(String s) {
name = s;
}
}
public class ShallowCopyTest {
public static void main(String[] args) {
//Original Object
Person p = new Person("Person-A", "Civic");
System.out.println("Original (orginal values): " + p.getName() + " - "
+ p.getCar().getName());
//Clone as a shallow copy
Person q = (Person) p.clone();
System.out.println("Clone (before change): " + q.getName() + " - "
+ q.getCar().getName());
//change the primitive member
q.setName("Person-B");
//change the lower-level object
q.getCar().setName("Accord");
System.out.println("Clone (after change): " + q.getName() + " - "
+ q.getCar().getName());
System.out.println("Original (after clone is modified): " + p.getName()
+ " - " + p.getCar().getName());
}
}
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