JAVA简明教程_chap11.txt

file javafilefilefile嵥io 11.1 file4 static string pathseparator /“;“ dospath static char pathseparatorchar /; static string separator /“ windows static char separatorchar / file3 public java.io.file(string pathname) public java.io.file(string parent,string filename) public java.io.file(file parent,string filename) pathnamefilenamefile 1 file / import java.io.*; class filecons public static void main(string args) try file f1 = new file(“c:“); file f2 = new file(“c:“,“windows“); file f3 = new file(f1,“sss.txt“); file f4 = new file(“filecons.java“); file f5 = new file(“asdf+?12/“); system.out.println(“path of f1 is “ + f2.getpath(); if (f3.exists() system.out.println(f3 +“ exists“); else f3.createnewfile(); system.out.println(“f3 was created!“); catch(java.io.ioexception e) e.printstacktrace(); / path of f1 is c:windows f3 was created! path of f4 is c:javacodezcbch11filecons.java path of f1 is c:windows c:sss.txt exists path of f4 is c:javacodezcbch11filecons.java f4f54 11.2 嵥 嵥listfile string list() string list(filenamefilter filter) 2 嵥 / import java.io.*; public class dirlist public static void main(string args) file dir = new file(“); string files = null; if(dir.exists() files = dir.list(); for (int i=0; i 2filter()filenamefilter / / dirlist2.java import java.io.*; public class dirlist2 public static filenamefilter filter(final string afn) / creation of anonymous inner class: return new filenamefilter() string fn = afn; public boolean accept(file dir, string n) / strip path information: string f = new file(n).getname(); return f.indexof(fn) != -1; ; / end of anonymous inner class public static void main(string args) try file path = new file(“.“); string list; if(args.length = 0) list = path.list(); else list = path.list(filter(args0); for(int i = 0; i “); system.exit(0); file f = new file(args0); if(!f.exists() system.out.println(f.tostring() +“ not exists!“); else if(f.isdirectory() system.out.println(“this is a directory“); else system.out.println(“this is a file“); printproperty(f); / 磺 java file1properties file1properties.java this is a file name: file1properties.java path: file1properties.java parent: null can read? true can write? true is hidden? false is readonly? true length: 1304 iast modified: wed jul 30 16:49:24 cst 2003 is absolute? false absolutepath: c:javacodezcbch11file1properties.java 11.5 java 2 filecreatetempfile file createtempfile(string prefix, string suffix) file createtempfile(string prefix, string suffix, file directory) prefixsuffix磬f.createtempfile(“$“,“$“)“$42154$“filewindowsc:windowstempdeleteonexit() 8 / import java.io.*; public class tempfiledemo public static void main(string args) file tempdir = new file(“c:temp“); file tmp1 = null; file tmp2 = null; try if (!tempdir.exists() tempdir.mkdir(); tmp1 = file.createtempfile(“$“, “ttt“, tempdir); tmp2 = file.createtempfile( “ttt“,“$“, tempdir); /tmp1.deleteonexit