filtrate.java

关于rmi方面的一些编程

package rmi;

import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
import java.lang.Math;

public class Filtrate extends UnicastRemoteObject implements RemoteFiltrate {
//numSign[]标示其对应下标的数是否是素数
	private boolean[] numSign;
//素数的个数
	private int primeNum;
//存放素数的数组
	private int[] prime;

	int j = 0;

	int n = 0;

	protected Filtrate() throws RemoteException {
		super();
	}
//利用素数的倍数不是素数
	public int[] getPrime(int num) throws RemoteException {
		numSign = new boolean[num + 1];
		for (int i = 1; i <= num; i += 2) {
			numSign[i] = true;
		}
		for (int i = 0; i < num + 1; i += 2) {
			numSign[i] = false;
		}
		numSign[1] = false;
		numSign[2] = true;
		primeNum = 0;
		n = (int) Math.sqrt(num);
		for (int i = 3; i <= n; i += 2) {
			if (numSign[i]) {
				j = i + i;
				while (j <= num) {
					numSign[j] = false;
					j += i;
				}
			}
		}
		for (int i = 0; i <= num; i++)
			if (numSign[i])
				primeNum++;
		prime = new int[primeNum];
		primeNum = 0;
		for (int i = 0; i <= num; i++)
			if (numSign[i]) {
				prime[primeNum] = i;
				primeNum++;
			}
		return prime;
	}
}