java复习(8)---I/O

package re08;

import java.io.*;
import java.util.Scanner;

public class IOTest {
    public static void main(String[] args) {

        File file = new File("d:/1.txt");   //File创建
        if (file.exists()) {
            file.delete();
        } else {
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        try {
            FileOutputStream out = new FileOutputStream(file);  //输出到文件
            byte byteout[] = "it‘s a test. ".getBytes();
            out.write(byteout);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        try {
            FileInputStream in = new FileInputStream(file);  //读入文件内容
            byte bytein[] = new byte[1024];
            int len = in.read(bytein);
            System.out.println("The message is: " + new String(bytein, 0, len));
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        Scanner sc = new Scanner(System.in);   //Scanner练习熟悉
        String line = sc.nextLine();  //读入行
        String line2 = sc.next();  
        int i = sc.nextInt();   //读入int
        double d = sc.nextDouble();  //读入double
        System.out.println(line + line2 + i + d);

    }

}