Write a Java program to calculate the sum of all even digits in a given integer input entered as a string. For example, for the input `234567`, the output should be `12`, as the even digits are 2, 4, ...
//Given an array nums of n integers and an integer target, are there elements a, b, c, and d in //nums such that a + b + c + d = target? Find all unique quadruplets ...
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