Java克隆执行浅拷贝
示例
克隆对象时的默认行为是执行对象字段的浅表副本。在这种情况下，原始对象和克隆对象都保留对相同对象的引用。
此示例显示了该行为。
import java.util.List;
public class Sheep implements Cloneable {
private String name;
private int weight;
private List<Sheep> children;
public Sheep(String name, int weight) {
this.name= name;
this.weight= weight;
}
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
public List<Sheep> getChildren() {
return children;
}
public void setChildren(List<Sheep> children) {
this.children= children;
}
}
import java.util.Arrays;
import java.util.List;
//创造一只羊
Sheep sheep = new Sheep("Dolly", 20);
//创造孩子
Sheep child1 = new Sheep("Child1", 4);
Sheep child2 = new Sheep("Child2", 5);
sheep.setChildren(Arrays.asList(child1, child2));
//克隆羊
Sheep dolly = (Sheep) sheep.clone();
List<Sheep> sheepChildren = sheep.getChildren();
List<Sheep> dollysChildren = dolly.getChildren();
for (int i = 0; i < sheepChildren.size(); i++) {
//打印为true，两个数组都包含相同的对象
System.out.println(sheepChildren.get(i) == dollysChildren.get(i));
}