Java程序设计Java程序设计 (20).pdf

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1、10/1.2.File3.4.5.stream)I/O1.VS InputStreamInputStream()OutputStreamOutputStreamVS JavaJavaUnicode Unicode 2.File2.FileFile java.io FilejavaFileFile/java.io.File File File Fileboolean createNewFile()boolean delete()static File createTempFile(String prefix,String suffix)prefixsuffixboolean mkdir()Str

2、ing list()File listFiles()static File listRoots()public String getName()public boolean canRead()public boolean canWrite()public boolean exist()public long length()public String getAbsolutePath()public String getParent()public boolean isDirectroy()public boolean isHidden()public long lastModified()pu

3、blic boolean isFile():FileTest.javaFile file=new File(test.txt);Fileexists()/getName()/length()/isDirectory()/Filetrycatch3.InputStreamOutputStreamInputStreamOutputStreamInputStreamreadInputStreamint read()1int read(byte b)b.lengthb,int read(byte b,int off,int len)lenb,offclose()OutputSreamwriteOutp

4、utStreamvoid write(int n)void write(byte b)void write(byte b,int off,int len)offlenvoid flush()close()close()1.2./3.()FileInputStreamFileOutputStream:TestStream.javaFileOutputStream.getBytes()flush?out.closefinallyFileNotFoundExceptionIOException4.ReaderWriterReaderreadReader:int read()int read(char

5、 cbuf)abstractintread(charcbuf,intoff,intlen)lenvoid close()ReaderWriterWriterwritewriteWriter:write(int c)write(String str)write(char cbuf)write(char cbuf,int off,int len)offlenflush()FileReader:public FileReader(String filename)public FileReader(File file)java.io.FileNotFoundExceptionFileWriter:pu

6、blic FileWriter(String filename)public FileWriter(File file)public FileWriter(String filename,boolean append)public FileWriter(File file,boolean append)true:TestFileReaderAndWriter.javaFileWriter out=new FileWriter(f);FileReader in=new FileReader(f);char c=new char(int)f.length();int?5.JVM(flush()Bu

7、fferedInputStream BufferedOutputStream BufferedInputStreamBufferedInputStream(InputStream in)BufferedInputStream(InputStream in,int size)BufferedOutputStreamBufferedOutputStream(OutputStream out)BufferedOutputStream(OutputStream out,int size)TestBufferedInputOutputStream.javawriteOutputStream out=ne

8、w FileOutputStream(hello.txt);BufferedOutputStream bos=new BufferedOutputStream(out);String info=;bos.write(info.getBytes();readFile f=new File(hello.txt);InputStream in=new FileInputStream(new File(“h.txt”);BufferedInputStream bis=new BufferedInputStream(in);byte b=new byte(int)f.length();in.read(b

9、);BufferedReaderBufferedWriterBufferedReaderBufferedReader(Reader in)BufferedReader(Reader in,int size)String readLine()int read()int read(char cbuf,int off,int len)BufferedWriterBufferedWriter(Writer out)BufferedWriter(Writer out,int size)void close()void flush()void newLine()void write(int c)void

10、write(String s,int off,int len)void write(char cbuf,int off,int len)TestBufferReadAndWriter.javawritefw=new FileWriter(file);/FileWriterWriterbw=new BufferedWriter(fw);for(int i=0;istr.length;i+)bw.write(stri);/bw.newLine();/nreadReader fr=new FileReader(file);BufferedReader br=new BufferedReader(fr);String string=null;string=br.readLine();/