甲骨文笔试精华汇总
AlternateHID
AlternateWorkSt
--------------
Housekeeper
HouseKeeperID
HouseKeeperName
SupervisorID
Supervisor
SupervisorID
SupervisorName
Duty
DutyID
FloorNo
DutyDate
-----------
HouseKeeperID
WorkStatus
AlternateHID
AlternateWorkSt
------------
Housekeeper
HouseKeeperID
HouseKeeperName
SupervisorID
Supervisor
SupervisorID
SupervisorName
Duty
DutyID
FloorNo
DutyDate
Transaction
DutyID
------------
HouseKeeperID
WorkStatus
AlternateHID
AlternateWorkSt
------------
Housekeeper
HouseKeeperID
HouseKeeperName
Supervisor
SupervisorID
SupervisorName
Duty
DutyID
FloorNo
DutyDate
Transaction
DutyID
HouseKeeperID
WorkStatus
AlternateHID
AlternateWorkSt
Oracle笔试题
Which of the following can contain duplicate values?
ArrayList HashSet TreeSet
A, B & C
B and C
A
A and C
---------------
Which of the following can contain duplicate values?
ArrayList HashSet TreeSet
www.77xue.com哦
A, B & C
B and C
A
A and C
---------------------------
public class Group {
ArrayList contents;
public Group() {
lst = new java.util.ArrayList();
};
public void add(String s) {
/* code to add something to contents here */
};
public void reverse() {
/* code to reverse the contents here */
};
}
public class GroupUser extends Thread {
Group group;
public GroupUser(Group g) {
group = g;
}
public void changeGroup() {
/* code that calls group.add() several times then group.reverse() */
}
public void run() {
for (int i = 0; i < 10; i++) changeGroup();
}
}
public static void main(String args[]) throws InterruptedException {
Group g = new Group();
new GroupUser(g).start();
new GroupUser(g).start();
new GroupUser(g).start();
}
Which of the following changes could you make to the code to prevent the three threads
started by main from interfering with each other’s use of the shared Group instance
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