Core java

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In this post, we will see how to get and set fields using reflection in java. java.lang.reflect.Field can be used to get/set fields(member variables) at runtime using reflection. Get all fields of the class All fields of the class can be obtained from the Class object. Here is an example. [crayon-6a29656429654363291770/] Field[] will have all […]

In this post, we will see how to access private fields and methods using reflection in java. Can you access private fields and methods using reflection? Yes, you can. It is very easy as well. You just need to call .setAccessible(true) on field or method object which you want to access. Access private field Class.getDeclaredField(String […]

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 […]