test.java

java应用开发详解

import java.io.*;

public class test 
{
    public static void main(String[] args) throws IOException 
    {
    	//测试File类中的静态变量
    	System.out.println("File.pathSeparator: "+File.pathSeparator);
    	System.out.println("File.separator: "+File.separator);
    	System.out.println("File.pathSeparatorChar:"+File.pathSeparatorChar);
    	System.out.println("File.separatorChar:"+File.separatorChar);
    	
    	File inputFile1 = new File("F:\\book\\2\\example\\file\\test.txt");
    	File inputFile2 = new File("test.txt");
    	File inputFile3 = new File("..\\file\\test.txt");
    	File inputFile4 = new File(".."+File.separator+"file"+File.separator+"test.txt");
    	
        //声明一个文件读入流
	FileInputStream in =null;
	//声明一个文件写入流
	PrintStream out =null;
        
        out = System.out;
        int c;
        	
        //我们通过打印文件的内容发现，四种方式构造的文件类是相同的。
        in = new FileInputStream(inputFile1);
        System.out.println("F:\\book\\2\\example\\file\\test.txt");
        while ((c = in.read()) != -1)
           out.write(c);
        
        System.out.println("");   
        in = new FileInputStream(inputFile2);
        System.out.println("test.txt");
        while ((c = in.read()) != -1)
           out.write(c);
           
        System.out.println("");   
        in = new FileInputStream(inputFile3);
        System.out.println("..\\file\\test.txt");
        while ((c = in.read()) != -1)
           out.write(c);
        
        System.out.println("");   
        in = new FileInputStream(inputFile4);
        System.out.println("..+File.separator+file+File.separator+test.txt");
        while ((c = in.read()) != -1)
           out.write(c);  
    	
    	in.close();
        out.close();
    		
    	
    }
}