Java语言实验报告四.doc

Java语言与面向对象程序设计基础课程实验报告四姓名： 学号：111*实验题1实验要求 掌握Java IO流处理 掌握文件操作 掌握多线程程序设计实验程序import java.io.*;public class Test4_1 public static void main(String args) try File myDir=new File(C:/Test);if ( !myDir.exists() myDir.mkdir();else if ( !myDir.isDirectory() System.err.println( C:/Test is not a directory); return;File f=new File(myDir,a.txt);f.createNewFile();FileWriter out = new FileWriter(f); for (int i=0;i26;i+) out.write(char)(A+i); out.close(); catch (IOException e) System.out.println(e); 运行结果实验结论与收获掌握文件及文件夹的创建及文件的写入。实验题2实验要求将实验1题中新建的a.txt文件内容复制到C:TestEx目录中b.txt文件中。实验程序import java.io.*;public class Test4_2 public static void main(String args) try File myDir=new File(C:/Test/Ex); if ( !myDir.exists() myDir.mkdir(); else if ( !myDir.isDirectory() System.err.println(myDir+ is not a directory); return; File myFile =new File(myDir,b.txt); myFile.createNewFile(); FileReader in= new FileReader(C:/Test/a.txt); BufferedReader bufIn = new BufferedReader(in); FileWriter out= new FileWriter (myFile); BufferedWriter bufOut= new BufferedWriter(out); String line; line = bufIn.readLine(); /System.out.println(line); while ( line!= null ) System.out.println(line); bufOut.write(line,0,line.length(); bufOut.newLine(); line = bufIn.readLine(); bufIn.close(); bufOut.close(); catch (IOException e) System.out.println(e); 运行结果实验结论与收获掌握文件读取和写入。实验题3实验要求 将实验1题中新建的“a.txt”文件中写入字符“*”，替换第6个字符。实验程序import java.io.*;public class Test4_3 public static void main(String args) try RandomAccessFile r = new RandomAccessFile(C:/Test/a.txt,rw); r.seek(5); r.write(*); r.close(); catch (IOException e) System.out.println(e); 运行结果实验结论与收获掌握随机文件创建与写入。实验题4实验要求 调试并记录多线程程序（生产者/消费者实例）结果。 体会多线程机制。实验程序Consumer.javaclass Consumer implements Runnable SStack theStack; public Consumer(SStack s) theStack = s; public void run() char c; for (int i=0;i20;i+) c = theStack.pop(); System.out.println(Consumed: +c); try Thread.sleep(int)(Math.random()*1000); catch(InterruptedException e) Producer.javaclass Producer implements Runnable SStack theStack; public Producer(SStack s) theStack = s; public void run() char c; for(int i=0; i20; i+) c =(char)(Math.random()*26+A); theStack.push(c); System.out.println(Produced: +c); try Thread.sleep(int)(Math.random()*100); catch(InterruptedException e) SStack.javaclass SStack private int index = 0;private char data = new char10;public synchronized void push(char c)while(index = data.length)try this.wait();catch(InterruptedException e) this.notify();dataindex = c; index+;public synchronized char pop() while(index =0)try this.wait();catch(InterruptedException e) this.notify(); index-; return dataindex;STest.javapublic class STestpublic static void main(String args)SStack stack = new SStack();Runnable p=ne