【每日日报】第三十四天

1 今天继续看书

Scanner类的应用

package File;
import java.util.Scanner;

public class ScannerDemo {
    public static void main(String[] args){
        Scanner con=new Scanner(System.in);
        String line=con.nextLine();
        int i=con.nextInt();
        double d=con.nextDouble();
        System.out.println(line);
        System.out.println(i);
        System.out.println(d);
        con.close();
    }
}

对象序列化

package File;
import java.io.Serializable;
public class Person implements Serializable{
    private String name;
    private int age;
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public int getAge(){
        return age;
    }
    public void setAge(int age){
        this.age=age;
    }
    public String toString(){
        return "姓名："+name+"，年龄："+age;
    }
}

使用ObjectOutputStream将对象写到文件中

package File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class ObjectOutputstreamDemo {
    public static void main(String[] args)throws IOException{
        ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("D:/Hello.txt"));
        Person p=new Person();
        p.setAge(20);
        p.setName("吴征云");
        oos.writeObject(p);
        oos.close();
    }
}

对象反序列化

package File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

public class ObjectInputStreamDemo {
    public static void main(String[] args)throws IOException,ClassNotFoundException{
        ObjectInputStream ois=new ObjectInputStream(new FileInputStream("D:/Hello.txt"));
        Person p=(Person)ois.readObject();
        ois.close();
        System.out.println(p);
    }
}

序列化一组对象

package File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream; 

public class ObjectInputStreamDemo2 {
    public static void main(String[] args)throws IOException{
        ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("D:/Hello.txt"));
        Person p=new Person();
        p.setAge(20);
        p.setName("吴征云");
        Person p2=new Person();
        p.setAge(20);
        p.setName("吴征云22");
        Person[] ps={p,p2};
        oos.writeObject(ps);
        oos.close();
    }
}

2 没什么问题

3 明天继续看书