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富士康企業集團招聘Java题目笔试题目

  编程题:

富士康企業集團招聘Java题目笔试题目

  1、继承时候类的执行顺序问题,一般都是选择题,问你将会打印出什么?

  答:父类:

  package test;

  public class FatherClass

  {

  public FatherClass()

  {

  System.out.println(“FatherClass Create”);

  }

  }

  子类:

  package test;

  import test.FatherClass;

  public class ChildClass extends FatherClass

  {

  public ChildClass()

  {

  System.out.println(“ChildClass Create”);

  }

  public static void main(String[] args)

  {

  FatherClass fc = new FatherClass();

  ChildClass cc = new ChildClass();

  }

  }

  输出结果:

  C:>java test.ChildClass

  FatherClass Create

  FatherClass Create

  ChildClass Create

  2、内部类的实现方式?

  答:示例代码如下:

  package test;

  public class OuterClass

  {

  private class InterClass

  {

  public InterClass()

  {

  System.out.println(“InterClass Create”);

  }

  }

  public OuterClass()

  {

  InterClass ic = new InterClass();

  System.out.println(“OuterClass Create”);

  }

  public static void main(String[] args)

  {

  OuterClass oc = new OuterClass();

  }

  }

  输出结果:

  C:>java test/OuterClass

  InterClass Create

  OuterClass Create

  再一个例题:

  public class OuterClass {

  private double d1 = 1.0;

  //insert code here

  }

  You need to insert an inner class declaration at line 3. Which two inner class declarations are

  valid?(Choose two.)

  A. class InnerOne{

  public static double methoda() {return d1;}

  }

  B. public class InnerOne{

  static double methoda() {return d1;}

  }

  C. private class InnerOne{

  double methoda() {return d1;}

  }

  D. static class InnerOne{

  protected double methoda() {return d1;}

  }

  E. abstract class InnerOne{

  public abstract double methoda();

  }

  说明如下:

  一.静态内部类可以有静态成员,而非静态内部类则不能有静态成员,

富士康企業集團招聘Java题目笔试题目

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富士康企業集團招聘Java题目笔试题目》(https://www.unjs.com)。

  故 A、B 错

  二.静态内部类的非静态成员可以访问外部类的静态变量,而不可访问外部类的非静态变量;return d1 出错。

  故 D 错

  三.非静态内部类的非静态成员可以访问外部类的非静态变量。

  故 C 正确

  四.答案为C、E

  3、Java 的通信编程,编程题(或问答),用JAVA SOCKET编程,读服务器几个字符,再写入本地显示?

  答:Server端程序:

  package test;

  import java.net.*;

  import java.io.*;

  public class Server

  {

  private ServerSocket ss;

  private Socket socket;

  private BufferedReader in;

  private PrintWriter out;

  public Server()

  {

  try

  {

  ss=new ServerSocket(10000);

  while(true)

  {

  socket = ss.accept();

  String RemoteIP = socket.getInetAddress().getHostAddress();

  String RemotePort = “:”+socket.getLocalPort();

  System.out.println(“A client come in!IP:”+RemoteIP+RemotePort);

  in = new BufferedReader(new

  InputStreamReader(socket.getInputStream()));

  String line = in.readLine();

  System.out.println(“Cleint send is :” + line);

  out = new PrintWriter(socket.getOutputStream(),true);

  out.println(“Your Message Received!”);

  out.close();

  in.close();

  socket.close();

  }

  }catch (IOException e)

  {

  out.println(“wrong”);

  }

  }

  public static void main(String[] args)

  {

  new Server();

  }

  };

  Client端程序:

  package test;

  import java.io.*;

  import java.net.*;

  public class Client

  {

  Socket socket;

  BufferedReader in;

  PrintWriter out;

  public Client()

  {

  try

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