java中IO流异常处理

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

public class Demo4 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
       
        getFile();
    }
    
    public static void getFile() {
        
        //1.找到目标文件
        File file = new File("D:\a.txt");
        //2.建立通道
        FileInputStream inputStream = null;
        try {
            inputStream = new FileInputStream(file);
            byte[] b = new byte[1024];
            try {
                int count = inputStream.read(b);
                System.out.println(new String(b,0,count));
            } catch (IOException e) {
                
                System.out.println("硬盘损坏了,请修理");
                
                throw new RuntimeException(e);
            }
            
            
        } catch (FileNotFoundException e) {
            
            System.out.println("文件不存在");
            //提示用户有错误要修改
            //让后面的代码定制运行
            //System.exit(0); 不太好，一般是不随意推出虚拟机。
            throw new RuntimeException(e);  //创建一个运行时异常
        }finally {
            
            try {
                inputStream.close();
            } catch (IOException e) {
                System.out.println("关闭失败");
                throw new RuntimeException(e);
            }
        }
    }
}