도도의 초록누리

        private String accnum;
        private int balance;

        public void setNum(String accnum)
        {
             this.accnum = accnum;  
        }

        public String getNum()
       {
            return this.accnum;
       }
 

         
       protected Object clone()
       {

               try{
                    Account account = (Account)super.clone();
                    return account;
               }
              catch(CloneNotSupportedException e)
              {
                   e.printStackTrace();
              }
              return null;
       } 

}

      public static void deepcopy()
     {
              Account source = new Account();
              source.setNum("111");
 
             Account target = (Account)source.clone(); // clone()은 Overliding으로 구현.
  
              System.out.println( "소스원본:" + source.getNum() );
              System.out.println( "대상-깊은 복사:" + target.getNum() );

              System.out.println( "원본값 계좌번호 변경 333\n" );

              source.setNum("333");

              System.out.println( "소스원본:" + source.getNum() );
              System.out.println( "대상-깊은 복사:" + target.getNum() + "\n" );
       }

       public static void shallowcopy()
       {
              Account source = new Account();
           source.setNum("111");

              Account target = source;
  
              System.out.println( "소스원본:" + source.getNum() );
              System.out.println( "대상-얇은 복사:" + target.getNum() );

              System.out.println( "원본값 계좌번호 변경 333\n" );
              source.setNum("333");

              System.out.println( "소스원본:" + source.getNum() );
              System.out.println( "대상-얇은 복사:" + target.getNum() + "\n" );
       }

       public static void main(String args[])
       { 
              System.out.println("--- 1.깊은 복사------------------");
           deepcopy();

              System.out.println("--- 2.얇은 복사------------------");
            shallowcopy();
       }

}