Core java

In this post, we will see how to invoke constructor using reflection in java. You can retrieve the constructors of the classes and instantiate object at run time using reflection. java.lang.reflect.Constructor is used to instantiate the objects. Instantiate Constructor with no parameters In case, you want to create object using no args constructor at runtime, […]

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In this post, we will see how to validate a password in java. Here are rules for password: Must have at least one numeric character Must have at least one lowercase character Must have at least one uppercase character Must have at least one special symbol among @#$% Password length should be between 8 and […]

In this post, we will see about regex to find currency symbols in a text. You can use below regex to find currency symbols in any text. \\p{Sc} Each unicharacter belongs to certain category and you can search for it using /p. Sc is short code for current symbol, so using \p{Sc}, we are trying […]

In this post, we will see about Luhn Algorithm in java Introduction Luhn algorithm, also known as modulus 10 or mod 10 algorithm, is a simple checksum process for validating various identification numbers such as credit card numbers, Canadian social securities numbers. This algorithm is designed to protect again mistyped or accidental error rather than […]

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