一个深复制例子
这是改的一个例子（关于深复制：连同该对象的引用一起复制）：
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class Professor implements Cloneable{ String name; int age; Professor(String name,int age) { this.name=name; this.age=age; } public Object clone() { Professor o=null; try { o=(Professor)super.clone(); } catch(CloneNotSupportedException e) { System.out.println(e.toString()); } return o; }}class Student implements Cloneable{ String name; int age; Professor p; Student(String name,int age,Professor p) { this.name=name; this.age=age; this.p=p; } public Object clone() { Student o=null; try { o=(Student)super.clone(); o.p=(Professor)p.clone(); } catch(CloneNotSupportedException e) { System.out.println(e.toString()); } return o; }}public class DeepClone{ public static void main(String[] args) { Professor p=new Professor("wangwu",50); Student s1=new Student("zhangsan",18,p); Student s2=(Student)s1.clone(); s2.p.name="lisi"; s2.p.age=30; System.out.println("name="+s1.p.name+","+"age="+s1.p.age); }}?下面是同样例子的浅复制（复制体中的引用和原体中的引用相同，指向同一内存地址）：
class Professor{ String name; int age; Professor(String name,int age) { this.name=name; this.age=age; }}class Student implements Cloneable{ String name; int age; Professor p; Student(String name,int age,Professor p) { this.name=name; this.age=age; this.p=p; } public Object clone() { Student o=null; try { o=(Student)super.clone(); } catch(CloneNotSupportedException e) { System.out.println(e.toString()); } return o; }}public class ShallowClone{ public static void main(String[] args) { Professor p=new Professor("wangwu",50); Student s1=new Student("zhangsan",18,p); Student s2=(Student)s1.clone(); s2.p.name="lisi"; s2.p.age=30; System.out.println("name="+s1.p.name+","+"age="+s1.p.age); }}??