Java 程序错误，提示需要类、接口(interface)或枚举

Question

import java.io.*;

            public class Test13
    {
            public static void main(String[] args) throws IOException 

    {

    FileInputStream fis1 = new FileInputStream("D:/abc.txt");

    FileInputStream fis2 = new FileInputStream("D:/xyz.txt");

    SequenceInputStream sis = new SequenceInputStream(fis1,fis2);

    int i;

    while((i = sis.read())!=-1)

    {

    System.out.println((char)i);

    }

    }
    }


    catch(Exception ex)

    {

     ex.printStackTrace();

    }

    }

    }

Answer 1

我想你尝试过类似的事情。我在异常处理中插入了一些解释

import java.io.FileInputStream;
import java.io.IOException;
import java.io.SequenceInputStream;

public class Test13 {

    //because all exceptions are already catched main will never throw one 
    public static void main(String[] args) throws IOException {
        try {
            //if an exception raises anywhere from here ...

            FileInputStream fis1 = new FileInputStream("D:/abc.txt");
            FileInputStream fis2 = new FileInputStream("D:/xyz.txt");
            SequenceInputStream sis = new SequenceInputStream(fis1, fis2);

            int i;
            while ((i = sis.read()) != -1) {
                System.out.println((char) i);
            }

            //... to here ...

        } catch (Exception ex) {
            //this catch block code will be executed
            ex.printStackTrace();           
        }
    }

}