4.5.4.2FileReader 与FileWriter类

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FielWriter 类不会自动调用 flash （清空缓存）方法所以需要手动调用 falsh 方法或调用 close 方法来清空缓存

使用 FileWriter 写入文件可以直接写入字符

使用例子

FileWriter fileWriter = new FileWriter( "src/cn/itcast/ioc/chars.txt" );

fileWriter.write( "wangxiang" );

fileWriter.close();

char [] chars = new char [1024];

FileReader fileReader = new FileReader( "src/cn/itcast/ioc/chars.txt" );

int len = fileReader.read(chars);

System. out .println( new String( chars ,0,len));

fileReader.close();