模板方法模式
(1)Client.java:
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package shiyan24; import java.util.Scanner; public class Client { public static void main(String[] args) { DBOperator db = null ; System.out.println( "请选择数据库:1、SQLServer 2、Oracle" ); Scanner input= new Scanner(System.in); int i=input.nextInt(); if (i== 1 ) { db= new SQLServerDB(); } else if (i== 2 ) { db= new OracleDB(); } db.process(); } } |
(2)DBOperator.java:
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package shiyan24; public abstract class DBOperator { public void process(){ connDB(); openDB(); useDB(); closeDB(); } public abstract void connDB(); public void openDB(){ System.out.println( "打开数据库" ); } public void useDB(){ System.out.println( "使用数据库" ); } public void closeDB(){ System.out.println( "关闭数据库" ); } } |
(3)OracleDB.java:
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package shiyan24; public class OracleDB extends DBOperator{ @Override public void connDB() { // TODO 自动生成的方法存根 System.out.println( "连接Oracle数据库" ); } } |
(4)SQLServerDB.java:
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package shiyan24; public class SQLServerDB extends DBOperator{ @Override public void connDB() { // TODO 自动生成的方法存根 System.out.println( "连接SQLServer数据库" ); } } |