黑马程序员Java自学编程代码实例

System.out.println(\ }

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;} }

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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。 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

138、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？

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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 = \

System.out.println(\ in = new BufferedReader(new

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InputStreamReader(socket.getInputStream())); String line = in.readLine();

System.out.println(\

out = new PrintWriter(socket.getOutputStream(),true); out.println(\ out.close(); in.close(); socket.close(); }

}catch (IOException e) {

out.println(\ } }

public static void main(String[] args) {

new Server(); } };

Client端程序: package test; import java.io.*;

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