某软件公司开发人员要创建一个数据库连接池,将指定个数的(如两个或3个)数据库连接对象存储在连接池中,客户端代码可以从池中随机取一个连接对象来连接数据库。试通过对单例类进行改造,设计一个能够自行提供指定个数实例对象的数据库连接类并用Java代码中的懒汉式，饿汉式分别编程模拟。

1. 懒汉式：

public class ConnectionPool {
    private static ConnectionPool connectionPool = null;
    private List<Connection> connectionList;

    private ConnectionPool(int count) throws SQLException {
        connectionList = new ArrayList<Connection>();
        for(int i=0; i<count; i++){
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf-8", "root", "root");
            connectionList.add(connection);
        }
    }

    public static synchronized ConnectionPool getInstance(int count) throws SQLException {
        if(connectionPool == null){
            connectionPool = new ConnectionPool(count);
        }
        return connectionPool;
    }

    public synchronized Connection getConnection(){
        if(connectionList.size() > 0){
            return connectionList.remove(0);
        }else{
            return null;
        }
    }

    public synchronized void close(Connection connection){
        if(connection != null){
            connectionList.add(connection);
        }
    }
}

2. 饿汉式：

public class ConnectionPool {
    private static ConnectionPool connectionPool = new ConnectionPool(2);
    private List<Connection> connectionList;

    private ConnectionPool(int count) throws SQLException {
        connectionList = new ArrayList<Connection>();
        for(int i=0; i<count; i++){
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf-8", "root", "root");
            connectionList.add(connection);
        }
    }

    public static ConnectionPool getInstance() {
        return connectionPool;
    }

    public synchronized Connection getConnection(){
        if(connectionList.size() > 0){
            return connectionList.remove(0);
        }else{
            return null;
        }
    }

    public synchronized void close(Connection connection){
        if(connection != null){
            connectionList.add(connection);
        }
    }
}