JavaIO编程(键盘输入，缓冲输入流、Scanner工具、序列化与反序列化)附带相关面试题

package Example1608;
import java.io.InputStream;
public class javaDemo {
    public static void main(String[] args)throws Exception {
        InputStream input = System.in;
        System.out.println("请输入数据");
        byte data[] = new byte[1024];
        int len;
        len = input.read(data);
        System.out.println(new String(data,0,len));
    }
}

package Example1609;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class javaDemo {
    public static void main(String[] args)throws  Exception {
//        System.in为InputStream类实例 ， 利用InputStreamReader转为Reader实例
        BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入你的年龄");
        String str;
        str = read.readLine();
        if (str.matches("\\d{1,3}")){
            System.out.println("你的年龄是"+str);
        }else {
            System.out.println("对不起你输入的年龄有误");
        }
    }
}

package Example1610;
import java.util.Scanner;
public class javaDemo {
    public static void main(String[] args) {
        System.out.println("随便输入");
        Scanner scan =new Scanner(System.in);
        if (scan.hasNextInt()){
            System.out.println("您输入的是整数型数据"+scan.next());
        }else{
            System.out.println("您输入的不是整数型数据"+scan.next());
        }
        scan.close();
    }
}

package Example1611;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class javaDemo {
    public static void main(String[] args)  throws Exception{
        System.out.println("请输入你的生日日期按照格式 yyyy-MM-dd");
        Scanner scanner = new Scanner(System.in);
        if (scanner.hasNext("\\d{4}-\\d{2}-\\d{2}")){
            SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd");
            Date date = simple.parse(scanner.next());
            System.out.println("你的生日日期是"+date);
        }else {
            System.out.println("抱歉你输入的格式有误，请重新输入");
        }
        scanner.close();
    }
}

package Example1612;
import java.io.*;
//实现Serializable说明该对象允许序列化
class member implements Serializable{
    private String name;
    private int age;
    private String hobby;
    member(String name,int age,String hobby){
        this.age = age;
        this.name = name;
        this.hobby = hobby;
    }
    @Override
    public String toString() {
        return "member{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", hobby='" + hobby + '\'' +
                '}';
    }
}
public class javaDemo  {
    private static final File Save_file = new File("E:"+File.separator+"jiawa"+File.separator+"test.member");
    public static void main(String[] args)throws Exception {
        saveObject(new member("黄小龙",99,"喜欢奖励自己"));
        System.out.println(readObject());
    }
//序列化
    public static void saveObject(Object obj)throws  Exception{
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(Save_file));
        out.writeObject(obj);
        out.close();
    }
//反序列化
    public  static  Object readObject()throws Exception{
        ObjectInputStream in = new ObjectInputStream(new FileInputStream(Save_file));
        Object obj =  in.readObject();
        in.close();
        return obj;
    }
}