import java.sql.Connection;
 
/**
 * 數(shù)據(jù)庫(kù)鏈接抽象類
 */
public abstract class AbstractDataBaseClass {
 
    /**
     * 注冊(cè)驅(qū)動(dòng)
     */
    public abstract void registerDriver();
 
    /**
     * 獲取鏈接
     * @return
     */
    public abstract Connection getConnection();
 
    /**
     * 執(zhí)行sql
     */
    public abstract void  executeSql();
 
    public void execute(){
        this.registerDriver();
        this.getConnection();
        this.executeSql();
    }
}

import java.sql.Connection;
 
/**
 * oracle具體實(shí)現(xiàn)類
 */
public class OracleDataBaseClass extends AbstractDataBaseClass {
    @Override
    public void registerDriver() {
        System.out.println("注冊(cè)oracle數(shù)據(jù)驅(qū)動(dòng)");
    }
 
    @Override
    public Connection getConnection() {
        System.out.println("獲取oracle數(shù)據(jù)庫(kù)鏈接");
        return null;
    }
 
    @Override
    public void executeSql() {
        System.out.println("在oracle數(shù)據(jù)庫(kù)中執(zhí)行sql");
    }
}

import java.sql.Connection;
 
/**
 * mysql具體實(shí)現(xiàn)類
 */
public class MysqlDataBaseClass extends AbstractDataBaseClass {
    @Override
    public void registerDriver() {
        System.out.println("注冊(cè)mysql數(shù)據(jù)驅(qū)動(dòng)");
    }
 
    @Override
    public Connection getConnection() {
        System.out.println("獲取mysql數(shù)據(jù)庫(kù)鏈接");
        return null;
    }
 
    @Override
    public void executeSql() {
        System.out.println("在mysql數(shù)據(jù)庫(kù)中執(zhí)行sql");
    }
}

public class DataBaseTest {
 
    public static void main(String[] args) {
        AbstractDataBaseClass mysql = new MysqlDataBaseClass();
        mysql.execute();
        System.out.println("----------------------------------------");
        AbstractDataBaseClass oracle = new OracleDataBaseClass();
        oracle.execute();
    }
}