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Core Java - Interview Questions and Answers for 'Apache common' - 2 question(s) found - Order By Rating

Q1. What is the difference between Java SE Map and Apache Commons MultiMap ? How can we implement functionality similar to multimap using Java SE map ?

Ans. We can have duplicate keys within MultiMap whereas we cannot have duplicate keys within Java Util Map.

We can have a Map with value as a "collection of values" instead of single value to have a similar function as Multimap.

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Q2. How to make sure that a string contains only Numerals ?

Ans. We can use NumberUtils.isNumber which is a part of apache commons package.

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