程序代码：

//缓冲流对文件进行读写
import *;
public class Example12_7{
    public static void main(String args[]){
        File file=new File("sb3.txt");
        String content[]={"大爷好","二爷我不好","三爷最近我心里烦","四爷我最近手头紧"};
        String content_2[]=new String[content.length];
        try{
            FileWriter outOne=new FileWriter(file);
            BufferedWriter outTwo=new BufferedWriter(outOne);
            for(String s:content){
                System.out.println(s);
                outTwo.write(s);  //conetent内容没有被写入文件？哪里出问题了？
                outTwo.newLine();
            }
            outOne.close();
            outTwo.close();

            FileReader inOne=new FileReader(file);
            BufferedReader inTwo=new BufferedReader(inOne);
            for(int i=0;i<content.length;i++){
                content_2[i]=inTwo.readLine();
                System.out.println(content_2[i]);
            }
            inOne.close();
            inOne.close();
        }
        catch(IOException e){};
    }
}