Deap Clone

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package others;

class c1 implements Cloneable {

c2 c2;

String b;

String c;

public c1(String b, String c, c2 c2) {
  this.b = b;
  this.c = c;
  this.c2 = c2;
}

public Object clone() {
  c1 o = null;
  try {
   o = (c1) super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
  }
  o.c2 = (c2) c2.clone();
  return o;
}

}

class c2 implements Cloneable {

String a;

public c2(String a) {
this.a = a;
}

public Object clone() {
  try {
   return (c2) super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
   return null;
  }
}

}

public class DeapClone {

public static void main(String[] args) {
  c2 c2 = new c2("2");
  c1 c1 = new c1("a", "b", c2);
  c1 c11 = (c1) c1.clone();
  c11.c2.a = "changed";
//改变c11中c2，c1里的c2并未改变。如果c2未实现clone方法，则c1里的c2并未改变将改变
  //对象中的对象必须实现clone，值则不用
  System.out.println(c1.c2.a);
}

}