种设计2

类设计2

? ? 有了前面的学习，现在该是解决ReportService和PdfReportService类之间的依赖关系了。

? ? 引入新的Container类：

public class ReportService {// private ReportGenerator generator = new PdfReportGenerator();private ReportGenerator generator = (ReportGenerator) Container.getInstance().getComponents("ReportGenerator");private int[][] data = new int[50][50];public void generateAnnulReport() {generator.generate(data);}public void generateMonthlyReport() {generator.generate(data);}public void generateDailyReport() {generator.generate(data);}}