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17 lines
524 B
17 lines
524 B
// 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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