【每日日报】第三十四天

1 今天继续看书

Scanner类的应用

 1 package File;
 2 import java.util.Scanner;
 3 
 4 public class ScannerDemo {
 5     public static void main(String[] args){
 6         Scanner con=new Scanner(System.in);
 7         String line=con.nextLine();
 8         int i=con.nextInt();
 9         double d=con.nextDouble();
10         System.out.println(line);
11         System.out.println(i);
12         System.out.println(d);
13         con.close();
14     }
15 }

对象序列化

 1 package File;
 2 import java.io.Serializable;
 3 public class Person implements Serializable{
 4     private String name;
 5     private int age;
 6     public String getName(){
 7         return name;
 8     }
 9     public void setName(String name){
10         this.name=name;
11     }
12     public int getAge(){
13         return age;
14     }
15     public void setAge(int age){
16         this.age=age;
17     }
18     public String toString(){
19         return "姓名："+name+"，年龄："+age;
20     }
21 }

使用ObjectOutputStream将对象写到文件中

 1 package File;
 2 import java.io.FileOutputStream;
 3 import java.io.IOException;
 4 import java.io.ObjectOutputStream;
 5 
 6 public class ObjectOutputstreamDemo {
 7     public static void main(String[] args)throws IOException{
 8         ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("D:/Hello.txt"));
 9         Person p=new Person();
10         p.setAge(20);
11         p.setName("吴征云");
12         oos.writeObject(p);
13         oos.close();
14     }
15 }

对象反序列化

 1 package File;
 2 import java.io.FileInputStream;
 3 import java.io.IOException;
 4 import java.io.ObjectInputStream;
 5 
 6 public class ObjectInputStreamDemo {
 7     public static void main(String[] args)throws IOException,ClassNotFoundException{
 8         ObjectInputStream ois=new ObjectInputStream(new FileInputStream("D:/Hello.txt"));
 9         Person p=(Person)ois.readObject();
10         ois.close();
11         System.out.println(p);
12     }
13 }

序列化一组对象

 1 package File;
 2 import java.io.FileOutputStream;
 3 import java.io.IOException;
 4 import java.io.ObjectOutputStream; 
 5 
 6 public class ObjectInputStreamDemo2 {
 7     public static void main(String[] args)throws IOException{
 8         ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("D:/Hello.txt"));
 9         Person p=new Person();
10         p.setAge(20);
11         p.setName("吴征云");
12         Person p2=new Person();
13         p.setAge(20);
14         p.setName("吴征云22");
15         Person[] ps={p,p2};
16         oos.writeObject(ps);
17         oos.close();
18     }
19 }

2 没什么问题

3 明天继续看书