75.Java异常处理机制throws

 package testDate;

 import java.io.FileNotFoundException;

 import java.io.FileReader;

 import java.io.IOException;

 public class TestReadFile {

     public static void main(String[] args) {

         String str = null;

         try {

             str = new TestReadFile().openFile();

         } catch (IOException e){

             e.printStackTrace();

         }

         System.out.println(str);

     }

     String openFile() throws FileNotFoundException,IOException{

         FileReader reader = new FileReader("d:/a.txt");

         char c= (char) reader.read();

         System.out.println(c);

         return "";

     }

 }