Java SE 095 Java字符流详解 续_免费下载

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1、JavaSE095Java字符流详解续一、FileWriterFileWriter创建一个可以写文件的Writer类。FileWriter继承于OutputStreamWriter。它最常用的构造方法如下：FileWriter(StringfilePath);FileWriter(StringfilePath,booleanappend);FileWriter(FilefileObj)append:如果为true,则将字节写入文本末尾处，而不是写入文件开始处。packagecom.javase.io2;importjava.io.FileWriter;

2、publicclassFileWriter1{publicstaticvoidmain(String[]args)throwsException{Stringstr="helloworldwelcomenihao";//FileWriter操纵的是字符或者是字符数组，字符串与字符数组是两个不同的对象，可以将其转换成字符数组char[]buffer=newchar[str.length()];//将字符串儿里面的内容复制到buffer数组str.getChars(0,str.length(),buffer,0);FileWriterwriter=newF

3、ileWriter("file2.txt");for(inti=0;i

4、length()];tmp.getChars(0,tmp.length(),ch,0);CharArrayReadercar=newCharArrayReader(ch);inti;while(-1!=(i=car.read())){System.out.println((char)i);}}}这个类既能读，又能写！packagecom.javase.io2;importjava.io.IOException;importjava.io.RandomAccessFile;publicclassRandomAccessFile1{publicstatic

5、voidmain(String[]args)throwsIOException{Personp=newPerson(1,"JieLin",160);RandomAccessFileraf=newRandomAccessFile("test.txt","rw");p.write(raf);Personp1=newPerson();raf.seek(0);//让读的位置重新回到文件开头p1.read(raf);System.out.println(p1.id+""+p1.name+""+p1.height);}}classPerson{intid;Stri

6、ngname;doubleheight;publicPerson(){}publicPerson(intid,Stringname,doubleheight){this.id=id;this.name=name;this.height=height;}publicvoidwrite(RandomAccessFileraf)throwsIOException{raf.writeInt(id);raf.writeUTF(name);raf.writeDouble(height);}publicvoidread(RandomAccessFileraf)thr

7、owsIOException{this.id=raf.readInt();this.name=raf.readUTF();this.height=raf.readDouble();}}