Java作业整理

Posted 2023-02-20 黄小鱼ZZZ

1. 编写一程序，实现基本数据的和对象数据的读写操作。

要求：(1) 向一个名为temp.dat的文件写入包含5个int型值和5个String型值。

      (2) 存储一个表示当前时间的Date对象。

(3) 改写第五题中的类，实现向temp.dat中写入10个Square（正方形）类对象。

(4) 将上述步骤写在一个方法wirteObject()中；编写另个方法readObject，读出上述数据。

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Scanner; 
public class Operate_File_IO
	
	public static void main(String[] args) throws IOException, ClassNotFoundException
    	  writeObject();
    	  readObject();
      
	  public static void writeObject() throws IOException
    	  int number;
    	  String str;
    	  
    	  Scanner input = new Scanner(System.in);
    	  ObjectOutputStream output =
    		  new ObjectOutputStream(new FileOutputStream("temp.dat"));
    	  
    	  
    	  System.out.println("Please input five integers and five strings: ");
for(int i = 0; i < 5;i++)
    		 number = input.nextInt();
    		 str = input.nextLine();
    		 output.writeInt(number);
    		 output.writeUTF(str);
    	  
    	  
          output.writeObject(new java.util.Date());    	  
    	  Square1[] squares = new Square1[10];
    	  for(int i = 0; i < 10; i++)
   	       squares[i] = new Square1(i+1);
	       output.writeObject(squares[i]);
    	  
    	output.close(); 
      


	public static void readObject() throws IOException, ClassNotFoundException 
			ObjectInputStream input = 
				new ObjectInputStream(new FileInputStream("temp.dat"));
			int[] array = new int[5];
			String[] ch = new String[5];
			int j = 0;
				for(j = 0; j < 5; j++)
				 array[j] = input.readInt();
			     ch[j] = input.readUTF();
				
            java.util.Date date = (java.util.Date)(input.readObject());	
				Square1[] squares1 = new Square1[10];
			   	   for(int i = 0; i < 10 ; ++i)
			   		   squares1[i] = (Square1)(input.readObject());
			   	   
			   	 System.out.println("The five integers and five strings are: ");
			   	 for(int r = 0; r < 5; r++)
			   		 System.out.println(array[r] + " " + ch[r]);
			   	 
			   	 System.out.println("The time is:" + date);
			   	 System.out.println("The ten squares are:");
	 for(int r = 0; r < 10 ;r++)
			   		 System.out.println(squares1[r]);
			   	   input.close();
			
			





import java.io.Serializable;

public class Square1 implements Serializable
      private double side;
      Square1[] squares = new Square1[12];
      public Square1(double side)
    	  this.side = side;
      
	public double getSide() 
		return side;
	
	public void setSide(double side) 
		this.side = side;