Unicode representation

Hi,
I `m new in JAVA programming and I would like to know, how can I get the Unicode representation (Hexadecimal number of length 4) of a character.
e.g. Given '0' as an input, the output should be 0030.

Thanks but I was looking for a function or something which takes a chaarcter as an input and returns its unicode representation. You see I want to encode a text. If anybody has some idea please share it with me
Thank You

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