Question: Java programming Questions: Im declaring keeper as a Map keeper = new HashMap (); When I use keeper.merge(problem, 20, (a, b) -> a + b);

Java programming Questions:

Im declaring keeper as a Map keeper = new HashMap<>(); When I use keeper.merge(problem, 20, (a, b) -> a + b); and problem is a string what am I doing exactly? Is this just a lambda expression?

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