Clone 方法的使用(深度克隆和浅克隆)

public class Sheep implements Cloneable {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public Sheep clone() throws CloneNotSupportedException {
return (Sheep) super.clone();
}
public static void main(String[] args) throws CloneNotSupportedException {
Sheepfold sheepfold1 = new Sheepfold();
sheepfold1.setName("第一个羊圈");
Sheep sheep1 = new Sheep();
sheep1.setName("第一只羊");
sheepfold1.setSheep(sheep1);
Sheepfold sheepfold2 = sheepfold1.clone();
sheepfold2.setName("第一个羊圈的克隆");
System.out.println("sheepfold1.name=" + sheepfold1.getName()
+ ",sheep.name=" + sheepfold1.getSheep().getName());
System.out.println("sheepfold2.name=" + sheepfold2.getName()
+ ",sheep.name=" + sheepfold2.getSheep().getName());
System.out.println("sheepfold1.sheep==sheepfold1.sheep?"
+ (sheepfold1.getSheep() == sheepfold2.getSheep()));
}
}
class Sheepfold implements Cloneable {
private String name;
private Sheep sheep;
@Override
public Sheepfold clone() throws CloneNotSupportedException {
Sheepfold o = (Sheepfold) super.clone();
return o;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Sheep getSheep() {
return sheep;
}
public void setSheep(Sheep sheep) {
this.sheep = sheep;
}
}

运行结果如下：
1. sheepfold1.name=第一个羊圈,sheep.name=第一只羊
2. sheepfold2.name= 第一个羊圈的克隆,sheep.name=第一只羊
3. sheepfold1.sheep==sheepfold1.sheep?true

@Override
public Sheepfold clone() throws CloneNotSupportedException {
Sheepfold o = (Sheepfold) super.clone();
o.sheep = this.sheep.clone();
return o;
}

运行结果
1. sheepfold1.name=第一个羊圈,sheep.name=第一只羊
2. sheepfold2.name= 第一个羊圈的克隆,sheep.name=第一只羊
3. sheepfold1.sheep==sheepfold1.sheep?false