class Order implements Runnable {
public void run() {
try { Thread.sleep(2000); } catch (Exception e) { }
System.out.print("in ");
}
public static void main(String [] args) {
Thread t = new Thread(new Order());
t.start();
System.out.print("pre ");
try { t.join(); } catch (Exception e) { }
System.out.print("post ");
} }
可产生哪两项结果?()
在Java语言中,如果你有下面的类定义:
Abstract class Shape{ Abstract void draw(); }
class Square extendeds Shape{}
如果你试图编译上面的代码会发生()。
在Java语言中,如果你有下面的类定义:
abstract class Shape {
abstract void draw(); }
Class Square extends Shape {}
如果你试图编译上面的代码会发生()。
路由器的部分配置如下:
Class-map match-any GOLD
match ip precedence ef
class-map match-any SILVER
Match ip dscp af31
Policy-map Branch
Class GOLD
Priority percent 20
Class SILVER
bandwidth percent 15
random-detect dscp-based
interface Serial0/1
description PPP link to BRANCH bandwidth 1536
ip address 10.200.40.1 255.255.255.252
encapsulation ppp
路由器配置VOICE数据流到优先级队列中,但发现并没有起到作用,可能什么原因?()
class java {
public static void main(String [] java) {
for (int Java = 1; Java 〈 java.length; Java++)
System.out.print("java ");
}
}
和命令行:
java java java java java
结果为:()
Following a successful migration,it is highly recommended that concurrent Volume Groups be Converted to enhanced concurrent capable Volume Groups.
In order to follow this recommendation,what step must be completed first?()
You are designing a top-level OU structure to meet the business and technical requirements.
Which top-evel OU or OUs should you use? ()
Given the following RMAN commands,choose the option that reflects the order required to restore your currently operational ARCHIVELOG-mode database.()
a. restore database
b. recover database
c. shutdown immediate
d. startup
e. restore archivelog all
f. alter database open
Refer to the exhibit. Given the configuration on a Teleworker router, and knowing it was in the process of being booted, what statement would best describe the order in which the head-end peers would be selected?()
现有:
class Tree {
private static String tree = "tree ";
String getTree () { return tree; }
}
class Elm extends Tree {
private static String tree = "elm ";
public static void main (String [] args) {
new Elm() .go (new Tree()) ;
}
}
void go (Tree t) {
String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ;
System.out.println (s) ;}
结果为:()
import java.io.*;
public class Forest implements Serializable {
private Tree tree = new Tree();
public static void main(String [] args) {
Forest f= new Forest();
try {
FileOutputStream fs = new FileOutputStream(”Forest.ser”);
ObjectOutputStream os = new ObjectOutputStream(fs);
os.writeObject(f); os.close();
} catch (Exception ex) { ex.printStackTrace(); }
}
}
class Tree { }
What is the result?()
public class TestOne {
public static void main (String[] args) throws Exception {
Thread.sleep(3000);
System.out.println(”sleep”);
}
}
What is the result?()
class Order implements Runnable {
public void run() {
try { Thread.sleep(2000); } catch (Exception e) { }
System.out.print("in ");
}
public static void main(String [] args) {
Thread t = new Thread(new Order());
t.start();
System.out.print("pre ");
try { t.join(); } catch (Exception e) { }
System.out.print("post ");
} }
可产生哪两项结果?()
给出下列java源代码:
//Point x
Public class Interesting{}
在源代码//point x处添加()能符合java语法
阅读以下代码:
public class Test{
public static void main(){
System.out.println(“x=”+x); } }
请问,代码运行的结果是?()
1. class Pizza {
2. java.util.ArrayList toppings;
3. public final void addTopping(String topping) {
4. toppings.add(topping);
5. }
6. }
7. public class PepperoniPizza extends Pizza {
8. public void addTopping(String topping) {
9. System.out.println(”Cannot add Toppings”);
10. }
11. public static void main(String[] args) {
12. Pizza pizza = new PepperoniPizza();
13. pizza.addTopping(”Mushrooms”);
14. }
15. }
What is the result?()
分析下列Java代码:
class A {
public static void main(String[] args) {
method(); }
static void method() { try {
System.out.println("Hello"); System.exit(0); }
finally {
System.out.println("good-bye"); } } }
编译运行后,输出结果是()。
Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given:
import java.io.*;
class Food {Food() { System.out.print(”1”); } }
class Fruit extends Food implements Serializable {
Fruit() { System.out.print(”2”); } }
public class Banana2 extends Fruit { int size = 42;
public static void main(String [] args) {
Banana2 b = new Banana2();
b.serializeBanana2(b); // assume correct serialization
b = b.deserializeBanana2(b); // assume correct
System.out.println(” restored “+ b.size + “ “); }
// more Banana2 methods
}
What is the result?()
在Java语言中,小明在他的包mypackage中定义了类My_Class, 在mypackage的子包mysubpackage中也有个类My_Class。小明用 import mypackage.*;引入包, 执行其中的语句: My_Class NewClass = new My_Class();时,将发生()。
import java.util.*;
public class PQ {
public static void main(String[] args) {
PriorityQueue
pq.add(”carrot”);
pq.add(”apple”);
pq.add(”banana”);
System.out.println(pq.poll() +”:” + pq.peek());
}
}
What is the result?()
What is wrong with the following code?()
class MyException extends Exception {}
public class Qb4ab {
public void foo() { try { bar(); } finally { baz();
} catch (MyException e) {}
}
public void bar() throws MyException {
throw new MyException();
}
public void baz() throws RuntimeException {
throw new RuntimeException();
}
}
Given:
11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println("B "); }
16. }
17. public static void main(String[] args) {
18. A a = new B();
19. a.process();
20. }
What is the result? ()
11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println(”B”); }
16. }
17. public static void main(String[] args) {
18. new B().process();
19. }
What is the result?()
import java.io.IOException;
public class ExceptionTest(
public static void main (Stringargs)
try (
methodA();
) catch (IOException e) (
system.out.printIn(“Caught IOException”);
) catch (Exception e) (
system.out.printIn(“Caught Exception”);
)
)
public void methodA () {
throw new IOException ();
}
What is the result?()
1. class Exc0 extends Exception { }
2. class Exc1 extends Exc0 { }
3. public class Test {
4. public static void main(String args[]) {
5. try {
6. throw new Exc1();
7. } catch (Exc0 e0) {
8. System.out.println(“Ex0 caught”);
9. } catch (Exception e) {
10. System.out.println(“exception caught”);
11. }
12. }
13. }
What is the result?()
现有:
class ThreadExcept implements Runnable {
public void run() { throw new RuntimeException("exception "); }
public static void main(String [] args) {
new Thread(new ThreadExcept()).start();
try {
int x = Integer.parseInt(args[0]);
Thread.sleep(x);
System.out.print("main ");
} catch (Exception e) { }
}
}
和命令行:
java ThreadExcept 1000
哪一个是结果?()
现有:
class ThreadExcept implements Runnable {
public void run() { throw new RuntimeException("exception "); }
public static void main(Stri_ng [] args) {
new Thread (new ThreadExcept()).start();
try {
int x=Integer.parselnt (args [0]);
Thread. sleep (x);
System.out.print("main");
} catch (Exception e) { }
}
}
和命令行: java ThreadExcept l000
哪一个是结果?()
Class TestException
1. public class TestException extends Exception {
2. } Class a:
1. public class a {
2.
3. public String sayHello(String name) throws TestException {
4.
5. if(name == null) {
6. throw new TestException();
7. }
8.
9. return “Hello “+ name;
10. }
11.
12. }
A programmer wants to use this code in an application:
45. A a=new A();
46. System.out.println(a.sayHello(”John”));
Which two are true?()
在J2EE中,有如下代码在Servlet1.Java中
Import javax.servlet.*;
Import javax.servlet.http.*
Import java.io.IOException;
Import java.io.PrintWriter;
Public class Servlet1 extends HttpServlet{
Public void init () throw ServletException {}
Public void service(HttpServletRequest request,
HttpServletResponce response) throws ServletException,IOException{
PrintWriter out=response.getWriter();
Out.println(“hello!”); } }
假如编译Servlet要具备的环境都已经建立好。现在用完全正确的命令编译该文件,对于以下成熟正确的是()
Which statements concerning the relationships between the following classes are true?()
class Foo { int num;
Baz comp = new Baz();
}
class Bar { boolean flag;
}
class Baz extends Foo {
Bar thing = new Bar();
double limit;
}
Given that Thing is a class, how many objects and reference variables are created by the following code?()
Thing item, stuff;
item = new Thing();
Thing entity = new Thing();
现有:
interface Data {public void load();}
abstract class Info {public abstract void load();}
下列类定义中正确使用Data和Info的是哪项?()
int [] my_Array;
my_Array = new int[5];
for(int count = 0; count <= 5; count++)
System.out.println(my_Array[count]);
以上Java代码运行的结果是()。
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