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File f=new File("readFile"); RandomAccessFile raF=newRandomAeeess Filel(; RandomAccessFile raF=new RandomAcccssFile(d:/mydir/File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAccessFite("readwriteFile",r
File myFile; myFile=new File("mulu/file"); File myFile=new file( ); myFile=new File("/mulu","filel"); File myDir=new file("/mulu"); myFile=new File(Dir"filel");
File myFile; myFile=new File("mulu/file"); File myFile=new File(); myFile=new FileC/mulu","filel"); File myDir=new file("/mulu"); myFile=new File(Dir, "filer');
File f=new File("readFile"); RandomAccessFile raF=new RandomAccessFile(; RandomAccessFile raF=new RandomAccessFile(d:/mydir/File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAceessFile("readwriteFile" ,r;
File dirObject=new File("d:/mydir"); File fileObject1:newFile(Filel.txt); File fileObject1:newFile("Filel.mt"); File fileO均ect2:newFile("d:knydir",File2.txt);
File类是java. io. file包中的非流类 File类以系统相关的方式描述文件对象的属性 File类不能读写文件 File类不能操作文件属性
File f=new File("readFile");
RandomAccessFile raF=new RandomAccessFile(f); RandomAccessFile raF=new RandomAccessFile(d://mydir//File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile",rw);
利用常对象可以调用任何不改变对象值的成员函数 利用常对象只能调用静态成员函数 常对象的成员都是常成员 利用常对象只能调用它的常成员函数
File f=new File("readFile");
RandomAccessFile raF=new RandomAccessFile(f); RandomAccessFile raF=new RandomAccessFile(d:/mydir/File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAceessFile("readwriteFile" ,rw);
File myFile;
myFile=new File("mulu/file");
File myFile=new file( );
myFile=new File("/mulu","filel");
File myDir=new file("/mulu");
myFile=new File(Dir"filel");
Java系统的标准输入对象是Systein 打开一个文件时不可能产生IOException 使用File对象可以判断一个文件是否存在 使用File对象可以判断一个目录是否存在
File dirObject=new File("d:/mydir"); File fileObject1:newFile(Filetx; File fileObject1:newFile("Filemt"); File fileO均ect2:newFile("d:knydir",File2.tx;
cp file1file2 mv file1file2 ls file1>file2 ll file1>file2
创建子目录 荻得文件长度 删除文件 判断文件的存在
File f=new File("readFile"); RandomAccessFile raF=new RandomAccessFile(; RandomAccessFile raF=new RandomAccessFile(d://mydir//File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile",r;
File类是jav i file包中的非流类 File类以系统相关的方式描述文件对象的属性 File类不能读写文件 File类不能操作文件属性
File myFile;
myFile=new File("mulu/file"); File myFile=new File(); myFile=new FileC/mulu","filel"); File myDir=new file("/mulu");
myFile=new File(Dir, "filer');
Java系统的标准输入对象是System.in 打开一个文件时不可能产生IOException 使用File对象可以判断一个文件是否存在 使用File对象可以判断一个目录是否存在
File f=new File("readFile"); RandomAccessFile raF=newRandomAeeess Filel(f);B) RandomAccessFile raF=new RandomAcccssFile(d:/mydir/File3.txt,"rw"); RandomAccessFile raF=new RandomAccessFile("readwriteFile","rw"); RandomAccessFile raF=new RandomAccessFite("readwriteFile",rw)