filtertest.java

Java语言程序设计-源代码（第三部分）和课程相对应的提供了一些用于学习理解的代码设计

import java.io.*;
public class FilterTest{
	public static void main(String[] args){
		File fileObj;
		FileOutputStream outStream;
		BufferedOutputStream bufOutObj;
		DataInputStream dataInObj;
		PushbackInputStream pushObj;
		try
		{
			String strObj = "How do you do!\r\nI am glad to meet you!";
			byte[] tempBuf;
			fileObj = new File("test.txt");
			if(fileObj.exists() == false)
			{
				fileObj.createNewFile();
			}
			outStream = new FileOutputStream(fileObj);
			bufOutObj = new BufferedOutputStream(outStream);
			tempBuf = strObj.getBytes();
			bufOutObj.write(tempBuf,0,tempBuf.length);
			bufOutObj.flush();
     		dataInObj = new DataInputStream(new FileInputStream(fileObj));
			System.out.println(dataInObj.readBoolean());
			int pushData;
			pushObj = new PushbackInputStream(new FileInputStream("test.txt"));
			while((pushData = pushObj.read())!=-1)
			{
				if(Character.isLetter((char)pushData))
				{
					System.out.print((char)pushData);
				}
				else
					System.out.print("**");
			}
		}catch(IOException e){
			System.out.println("error:" + e);
		}
	}
}