2 changed files with 23 additions and 0 deletions
@ -0,0 +1,6 @@ |
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public class ExcelReport implements ReportInter{ |
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@Override |
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public void generate() { |
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System.out.println("生成Excel报表"); |
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} |
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} |
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@ -0,0 +1,17 @@ |
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// 原始错误代码:违反开闭原则
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public class OldReport { |
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public void generate(String type){ |
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if(type.equals("PDF")){ |
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System.out.println("生成PDF报表"); |
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}else if(type.equals("Excel")){ |
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System.out.println("生成Excel报表"); |
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} |
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// 缺点:新增格式必须修改这里的if else
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} |
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public static void main(String[] args) { |
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OldReport r = new OldReport(); |
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r.generate("PDF"); |
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r.generate("Excel"); |
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} |
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} |
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