String sql＝"delete from book where bookName＝?";

PreparedStatement pst＝con.preparedStatement(sql);

______________________________

pst.execute(); 

Iterator it = list.iterator();

int index = 0;

while (it.hasNext()){

     Object obj = it.next();

     if (needDelete(obj)) { //needDelete返回boolean，决定是否要删除

           ______________________________

     }

     index ++;

}

class Foo{

public static void test(){

System.out.println("Foo");

}

} 

Public class Moo extends Foo{

public static void test(){

System.out.println("Moo");

}

public static void main(String[] args){

Foo ff = new Moo();

ff.test();

}

}

int a = 10;

int t = 0;

do{

    t = a++;

}while(t <= 5);