Мне нужна быстрая помощь в java

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Two days, I try to solve this accessory. I can solve it. I hope someone can help me as soon as possible

The problem is I don’t know how to create a file in which the positive numbers are and the other is in the negative

Exercise 2 :

Create a file “input.txt” containing an arbitrary integer values (use Math.random)
Create 2 files “positive.txt” and “negative.txt” containing respectively positive integers and negative integer from input.txt.
 
Exercise 3 :

 

Exercise 2 using binary files.

Что я уже пробовал:

This is the code I made, but the above things remain

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

public class  JavaApplication57 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws Exception {
        // TODO code application logic here
       Scanner cc = new Scanner(System.in);
       System.out.println("Enter the Name of File 1 = \n");
       String name1 = cc.nextLine();
       System.out.println("Enter the Name of File 2 = \n");
       String name2 = cc.nextLine();
       
       ObjectOutputStream O1 = new  ObjectOutputStream(new FileOutputStream(name2));
       ObjectInputStream  I1 = new  ObjectInputStream(new FileInputStream(name2));
       
       ObjectOutputStream O2 = new  ObjectOutputStream(new FileOutputStream(name1));
       ObjectInputStream  I2 = new  ObjectInputStream(new FileInputStream(name1));
       
       
       int doubleNu;
       for(int i =0; i<100;i++){
           double k=-1;
           double m =(double)i;
             int s=((int)((Math.random()*100)*Math.pow(k, m)));
         
       }
       
       O1.close();
       O2.close();
       
       try
       {
           while((doubleNu=I1.readInt())!=1)
           {
               
                O2.writeInt(doubleNu*2);
           }
       }
        catch(EOFException e){
            
        }
        O2.close();
        I1.close();
        
        
        //ObjectInputStream  I2 = new  ObjectInputStream(new FileInputStream(name1));
        
         try
       {
           while((doubleNu=I1.readInt())!=-1)
           {
               System.out.println(" " + doubleNu);
           }
       }
        catch(EOFException e){
            
        }
        I1.close();
        
        try
       {
           while((doubleNu=I2.readInt())!=-1)
           {
               System.out.println(" " + doubleNu);
           }
       }
        catch(EOFException e){
            
        }
        I2.close();
    }
}

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