driver.java

来自「Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套」· Java 代码 · 共 67 行

import java.io.*;

/** Program to write to a new text file, called example.txt  (Figure 13.21)
 *  Author: David Riley
 *  Date: January, 2005
 */
public class Driver  {

    public Driver()   {
		try {
			FileOutputStream outStream;
            PrintWriter printWriter;
			
			outStream = new FileOutputStream( "example.txt" );
			printWriter = new PrintWriter( outStream );
			printWriter.print( 12 );
        	printWriter.print( true );
			printWriter.println( 98.7 );
			printWriter.print( "hello world" );
			printWriter.print('Z');
			printWriter.flush();
			printWriter.close();
		}
		catch (IOException e)  {
			System.out.println("ERROR writing." );
		}

            
        try {
            int inInt;
            char inChar;
            FileReader inReader;
            BufferedReader bReader;
            inReader = new FileReader( "example.txt" );
            bReader = new BufferedReader( inReader );
            
            inInt = bReader.read();
            while ( inInt != -1 )   {
                inChar = (char) inInt;
                System.out.println(inChar);
                inInt = bReader.read();
            }
            bReader.close();
        }
        catch (IOException e)  {
            System.out.println("ERROR reading." );
        }
        
        try {
            String inStr;
            FileReader inReader;
            BufferedReader bReader;
           	inReader = new FileReader( "example.txt" );
            bReader = new BufferedReader( inReader );
           	inStr = bReader.readLine();
            while ( inStr != null )   {
                System.out.print(inStr + "//");
                inStr = bReader.readLine();
            }
            bReader.close();
        }
        catch (IOException e)  {
            System.out.println("ERROR reading." );
        }
   }
}