numsio.java

大整数相乘

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

/*
 * Created on 2006-11-13
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author Shenjun
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class NumsIO {
	
	/**
	 * 
	 */
	public NumsIO(String out,int N) {
     
	try {
		output=new FileOutputStream(out);
		int i=0;
		int tempRandom;
		while(i<N){
		    tempRandom=r.nextInt(10);
			System.out.print(" "+tempRandom);
			try {
				output.write(tempRandom);
				i++;
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
		output.close();
			// TODO Auto-generated constructor stub
	} catch (FileNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	}
	/**
	 * 
	 */
	private void GetNums(String in) {
		try {
			FileInputStream input=new FileInputStream(in);
			try {
				System.out.println("Get the NUMS!!");
				int t=input.read();
				while (t!=-1) {
					//addToHead(t);
					
					System.out.print(" "+t);
					t=input.read();
				}
				input.close();
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
	}
	private FileOutputStream output;
	private Random r=new Random();
	private int N=5000;
	public static void main(String[] args) {
		NumsIO numProducer=new NumsIO("num1.txt",1000);
		NumsIO numProducer2=new NumsIO("num2.txt",1000);
		//numProducer.GetNums("num2.txt");
	}
}