JDBC -- Connection Pool

package com.pp.pool;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import com.pp.util.JdbcUtil;

/*
 * Simulate the completion of connetion pool
 */
public class SimpleConnectionPool {
    private static List<Connection> pool = new ArrayList<Connection>();

    static {
        for (int i = 0; i < 10; i++) {
            Connection conn = JdbcUtil.getConnection();
            pool.add(conn);
        }

    }

    // get the connection object from cache pool
    public synchronized static Connection getConnection() {
        if (pool.size() > 0) {
            Connection conn = pool.remove(0);
            return conn;
        } else {
            throw new RuntimeException("Server is busy!");
        }
    }

    // return the connection
    public static void releas(Connection conn) {
        pool.add(conn);
    }
}