import *;
public class TestReader{
    public static void main(String args[]) {
        FileReader in = null;
        FileWriter out = null;
        int b=0 ;
        try{
        in = new FileReader("e:/java/io/TestOutputStream.java");
        out= new FileWriter("e:/java/io/test/outFile.dat");            
        while(((b=in.read()) != -1)){
            out.write(b);
            System.out.print((char)b);
        }
        in.close();
        System.out.println("文件复制成功！");
        }catch(FileNotFoundException  e){
            System.out.println("找不到文件");
        }catch(IOException Ee){
            System.out.println("文件复制失败");
        }
    }
}

能够正常运行`、
为什么创建出来的outFile.dat文件是空的呢`
TestOutputStream.java文件里面有东西的啊`
是out.write(b);这个语句写错了么？

import *;
public class TestReader{
    public static void main(String args[]) {
        FileReader in = null;
        FileWriter out = null;
        int b=0 ;
        try{
        in = new FileReader("e:/java/io/TestOutputStream.java");
        out= new FileWriter("e:/java/io/test/outFile.dat");            
        while(((b=in.read()) != -1)){
            out.write(b);
            System.out.print((char)b);
        }
        in.close();
        out.flush();//＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝少了这一句。
        System.out.println("文件复制成功！");
        }catch(FileNotFoundException  e){
            System.out.println("找不到文件");
        }catch(IOException Ee){
            System.out.println("文件复制失败");
        }
    }
}

少了out.close();