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Find factorial for big-numbers without using BigInteger/BigDecimal. (Hint: Multiply digits one by one and store in a string/arraylist);
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Learn ASCII
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Capitalize first letter of string using streams. ==> if no stream use subString
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Sort String in both order using streams.
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sort a collection of custom class using
Comparator
and not usingCollections.sort
--- https://www.hackerrank.com/challenges/java-sort/problem?isFullScreen=true -
implement singleton pattern --> see how you can keep track that only one object is created.
Problems in Question: