httpservlet体现了什么设计模式？

Question

httpservlet体现了什么设计模式

Answer 1

我们分析HttpServlet源代码就会发明,其供给了一个public的构造函数,此外也不能找到static的getInstance方法。import java.awt.Font;import java.util.HashMap;import java.util.Map;interface FontProvider {public Font getFont(String name);}class DefaultFontProvider implements FontProvider {public Font getFont(String name) {return new Font(name, Font.PLAIN, 12);}}class BufferedFontProvider implements FontProvider {private FontProvider fontProvider;private Map<String, Font> fontCache = new HashMap();public BufferedFontProvider(FontProvider fontProvider) {this.fontProvider = fontProvider;}