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學習 jxl API文件的一個錯誤

標題講的jxl,是指Java Excel API,又稱為 Java Excel Library。 http://jexcelapi.sourceforge.net/resources/javadocs/2_6_10/docs/index.html 這裡要指出的錯誤是,Sheet物件 findCell 用 regular expression 方法,它找資料是 column by column, 也就是開M

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學習 Java的HashMap concurrentModificationException

http://stackoverflow.com/questions/85190/how-does-the-java-for-each-loop-work 引用此頁的資料 for(Iterator<String> i = someList.iterator(); i.hasNext(); ) { String item = i.next(); System.out.println(item); } Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for( : ) idiom, since the actual Iterator is merely inferred. As was noted by Denis Bueno, this code works for any object that implements the

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Howard Lee, Frontend-engineer with Angular 7+, Typescript, ReactJS, VueJS. Flutter, Dart, PHP, Ruby, JavaScript, HTML, SASS, CSS, Postgres, MySQL, Web Developer. Have a certificate of AWS Solution Architect Associate with verify number: 8FYNL55LCEEQ10W5. You can verify at AWS Certificate site or Credly site Tech lead role Lead 4 colleagues to build products and infrastructure Coordinate schedule of delivering products Senior web frontend developer role Products Form-filling, form-sharing, file-management, repair-managemnt and project-management for construction industry at Suiqui IoT management and EC platform for Liquid Petroleum Gas(LPG) at Wave-In Comm.

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