302294ab2f410018187e8f4f0cfd5be6

订餐系统

package Dao;

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

public final class Env {
	private static Env instance;
	
	public static Env getInstance()
	{
		if(instance != null)
		{
			return instance;
		}
		else
		{
			makeInstance();
			return instance;
		}
	}
	public static synchronized void makeInstance()
	{
		if(instance == null)
		{
			instance = new Env();
		}
	}
}