도도의 초록누리

->$ sudo apt-get install oracle-java8-installer

2. Java 7 설치

->$ sudo apt-get install oracle-java7-installer

3. Java 6 설치

->$ sudo apt-get install oracle-java6-installer

        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();
       }

}

    System.out.println(Data);

}

      String cardNo;
 
      int pay ( String cardNo, int amount ) throws Exception{
      if ( !cardNo.equals(this.cardNo) || (this.balance < amount ) )
           throw new Exception("지불이 불가능합니다.");
      return withdraw(amount);
     

      }
} 

class InheritanceExample{                                                                              
                                                                                                    
      public static void main(String args[]) 

     {                                                            

          CheckingAccount obj;

          obj = new CheckingAccount();                                                   
          obj.accountNo = "110-22-333333";                                                          
          obj.ownerName = "홍길동";                                                                     
          obj.cardNo = "5555-6666-7777-8888";                 
          obj.deposit(100000);                                                                           
                                                                                                 
          try{                                                                                           

                 int paidAmount = obj.pay("5555-6666-7777-8888", 47000);
                 System.out.println("지불액:" + paidAmount);                          
                 System.out.println("잔액:" + obj.balance);                 
                                                                                            
          } catch(Exception e)                                                                           
          {                                                                                             
                  System.out.println(e.getMessage());            

           }              
                             
      }                                                                                                                                               
}                                                                                                     

class Account{
      String accountNo;
      String ownerName;
      int balance;
  
      void deposit(int amount){
            balance += amount;
      }
 
      int withdraw(int amount) throws Exception{
  
             if (balance < amount)
                   throw new Exception("잔액이 부족합니다.");
             else
                   balance -= amount;
  
             return amount;

       }
 
} 

class CheckingAccount extends Account{

       String cardNo;

       CheckingAccount(String accountNo, String ownerName, int balance, String cardNo){
           this.accountNo = accountNo;
           this.ownerName = ownerName;
           this.balance = balance;
           this.cardNo = cardNo;

      }
 
       int pay(String cardNo, int amount) throws Exception{

       if ( !cardNo.equals(this.cardNo) || (this.balance < amount))
                  throw new Exception("지불이 불가능합니다.");
  

       return withdraw(amount);

  }
 
} 

    {                                                                             
        CheckingAccount obj;

        obj = new CheckingAccount("113-333-333333", "홍길동", 100000, "5555-6666-7777-8888");
                                                                                              
       try {
             int paidAmount = obj.pay("5555-6666-7777-8888",47000);
             System.out.println("지불액:" + paidAmount);
             System.out.println("잔액:" + obj.balance);
       } catch(Exception e) {
             System.out.println(e.getMessage());

       } 
   }
}