问答题POWER BUILDER中事务对象有何作用?
问答题
POWER BUILDER中事务对象有何作用?
参考解析
解析:
暂无解析
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在J2EE中,接受一个XML文档,返回document对象,以分析该XML文档,可以使用如下()方法获得document对象 A.Documentdoc=DocumentBuilderFactory.parse(“my.xml”);B.Documentdoc=DocumentBuilder.parse(“my.xml”);C.DocumentBuilderFactorydbf=DocumentBuilderFactory.newInstance();DocumentBuilder builder=dbf.newDocumentBuilder();Documentdoc=builder.parse(“my.xml”);D.DocumentBuilderbuilder=newDocumentBuilder();Documentdoc=builder.parse(“my.xml”);
Power Builder具有的功能特点包括( )。Ⅰ.提供了良好的跨平台性Ⅱ.具有自己的编程语言Power ScriptⅢ.是一种面向对象的开发工具Ⅳ.事件驱动的程序设计方式A.Ⅰ和ⅡB.Ⅰ和ⅢC.Ⅱ、Ⅲ和ⅣD.全都是
阅读以下说明和Java代码,回答问题[说明]在某些系统中,存在非常复杂的对象,可以采用循序渐进的方式进行组合将小对象组合,成复杂的对象。以下实例展示了Builder(生成器)模式。该实例用来建立“文件”,文件内容包括:一个标题、一串字符以及一些有项目符号的项目。Builder类规定组成文件的方法,Director类利用这个方法产生一份具体的文件。图6-1显示了各个类间的关系。以下是Java语言实现,能够正确编译通过。[Java代码]//Builder. java文件public (1) class Builder {public abstract void makeTitle(String title);public abstract void makeString(String str);public abstract void makeItems(String[] items);public abstract Object getResult();}//Director. java文件public class Director{private (2) builder;public Director(Builder builder){this. builder = builder;}public Object construct(){builder.makeTitle("Greeting");builder.makeString("从早上到白天结束");builder.makeItems(new String[]{"早安", "午安",});builder.makeString("到了晚上");builder.makeItems(new String[]("晚安", "好梦",});return builder.getResult();}}//TextBuilder.java文件public class TextBuilder (3) Builder{private StringBuffer buffer = new StringBuffer();public void makeTitle(String title){buffer.append("『" + title + "』"\n\n");}public void makeString(String str){buffer.append('■' + str + "\n\n ");}public void makeItems(String[] items){for(int i = 0; i (4) ; i++){buffer.append('·' + items[i] + "\n");}buffer.append("\n");}public Object getResult(){return buffer.toString();}}//Main.java文件public class Main {public static void main(String[] args) {Director director = new Director(new TextBuilder());String result = (String)director. (5) ;System.out.println(result);
单选题在J2EE中,接受一个XML文档,返回document对象,以分析该XML文档,可以使用如下()方法获得document对象ADocument doc=DocumentBuilderFactory.parse(“my.xml”);BDocument doc=DocumentBuilder.parse(“my.xml”);CDocumentBuilderFactory dbf= DocumentBuilderFactory.newInstance(); DocumentBuilder builder=dbf.newDocumentBuilder(); Document doc=builder.parse(“my.xml”);DDocumentBuilder builder=new DocumentBuilder(); Document doc=builder.parse(“my.xml”);