代码：

package deepcopy;  public class DeepCopy {     static class Body implements Cloneable {         public Head head;          public Body() {         }          public Body(Head head) {             this.head = head;         }         //重写 clone 方法         @Override         protected Object clone() throws CloneNotSupportedException {             Body newBody = (Body) super.clone();             newBody.head = (Head) head.clone();             return newBody;         }     }      static class Head implements Cloneable {         public Face faces;          public Head() {         }          public Head(Face face) {             this.faces = face;         }         //重写 clone 方法         @Override         protected Object clone() throws CloneNotSupportedException {             Head head = (Head) super.clone();             head.faces = (Face)this.faces.clone();             return head;         }     }      static class Face implements Cloneable{         //重写 clone 方法         @Override         protected Object clone() throws CloneNotSupportedException{             return super.clone();         }     }      public static void main(String[] args) throws CloneNotSupportedException {         Body body = new Body(new Head());         Body body1 = (Body) body.clone();         System.out.println(body == body1);         System.out.println(body.head == body1.head);         System.out.println(body.head.faces == body1.head.faces);         System.out.println(body.head);         System.out.println(body1.head);     } }