写文件，读文件并翻转输出在控制台

获取数组信息，写入文件，读文件，并把数据翻转输出到控制台

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


public class writeFile {
	
	/**
	 * 读取文件并把文件内容翻转
	 * @throws IOException
	 */
	public void readFile() throws IOException{
		
		File file = new File("D:/test.txt");
		
		if(!file.exists()||file.isDirectory()){
		
			throw new FileNotFoundException();
		}
		
		FileInputStream in = new FileInputStream(file);
		
		StringBuffer sb = new StringBuffer();
		
		byte[] buff = new byte[1024];
		
		while(in.read(buff) != -1){
			
			sb.append(new String(buff));
			
			System.out.println(sb.reverse().toString().trim());
			
		}
		
	}

	/**
	 * 把整型数组内容写入到文件中
	 * @param daa
	 */
	public void write(int[] daa){
		
		try {
			FileOutputStream  out = new FileOutputStream(new File("D:/test.txt"));
			
			for(int i = 0;i < daa.length;i++){
				
				StringBuffer sb = new StringBuffer();
			
				sb.append(daa[i]);
				
				if(i<daa.length-1){
				
				sb.append(',');
				
				}
				out.write(sb.toString().getBytes("UTF-8"));
				
			}
			
			out.close();
			
		} catch (FileNotFoundException e) {
			
			e.printStackTrace();
			
		} catch (IOException e) {
			
			e.printStackTrace();
			
		}
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException {

		int daa[]={1,34,56,89,65,12,32,56,89};
		
		writeFile wf = new writeFile(); 
		
		wf.write(daa);
		
		wf.readFile();
					
	}

}