fileexp.java

Java课堂练习

/**
 * @(#)FileExp.java
 *
 *
 * @author 
 * @version 1.00 2007/11/15
 */
import java.io.*;

class FileAccept implements FilenameFilter  {

 String str=null;
 FileAccept(String s)
 {
  str="."+s;
 }
 public boolean accept(File dir,String name) 
 {
  return name.endsWith(str);
 }
}
        
   
 public class FileExp {   
  
    public FileExp() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        File  dir=new File("E:\\myjava\\kafei");
        FileAccept  acceptCondition=new FileAccept("java");
        String fileName[]=dir.list();
        for (int i=0; i<fileName.length; i++)
        {
         System.out.println(fileName[i]);
        }
        File f1=new File("E:\\myjava\\kafei","CheckBoxExp.java");
        System.out.println(f1.getName()+"可读吗?"+f1.canRead());
        System.out.println(f1.getName()+"可写吗?"+f1.canWrite());
        System.out.println(f1.getName()+"的长度为"+f1.length());
        System.out.println(f1.getName()+"的绝对路径为"+f1.getAbsolutePath());
        System.out.println(f1.getName()+"是目录吗?"+f1.isDirectory());
        System.out.println(dir.getName()+"是目录吗?"+dir.isDirectory());
        System.out.println(f1.getName()+"是隐藏的吗?"+f1.isHidden());
        System.out.println(f1.getName()+"最后修改的时间为"+f1.lastModified());
        System.out.println(f1.getName()+"的父目录为"+f1.getParent());        
        File f2=new File("E:\\myjava\\kafei","3.txt");
        if (!f2.exists())
        {
          try {
          	f2.createNewFile();
          }
          catch (Exception e) {
          	System.out.println("发生异常!");
          }
        }
        File ff=new File("4.txt");
        try
        { 
         f2.renameTo(ff);
         System.out.println("Rename success!");
        }
        catch (Exception e){
         System.out.println("error!");
        }
        File  dir2=new File("E:\\myjava\\kafei\\newdir");
        if (!dir2.exists())
        {
         System.out.println("创建文件夹...");
         try {
         dir2.mkdir();
         }
         catch(Exception e) {
          System.out.println("创建文件夹时发生异常!");
         }
        }
        if (dir2.exists())
        {
         System.out.println("删除文件夹...");
         try {
         dir2.delete();
         }
         catch(Exception e){
          System.out.println("删除文件夹过程中发生异常!");
         }
        }
        try {        
        Runtime ce=Runtime.getRuntime();
        ce.exec("javac ButtonLabelExp.java");
        ce.exec("java ButtonLabelExp");
        
        }
        catch (Exception e) {
         System.out.println(e);
        }     
    }
}