Solving the 'Unique Number of Occurrences' Problem in Java LeetCode 75 Study Plan

In this video, part of the LeetCode 75 Study Plan playlist, we tackle the 'Unique Number of Occurrences' problem. We create an efficient solution in Java, using the HashMap and HashSet classes to keep track of each integer's occurrence in the array. First, we traverse the array and record the frequency of each number in a HashMap. Then, we convert the values (occurrences) of the HashMap into a HashSet, which automatically removes any duplicate occurrences. Finally, we compare the size of the HashSet with the size of the HashMap. If they're equal, it implies that all the occurrences were unique, returning true; otherwise, we return false. Tune in for a step-by-step walkthrough of this problem and solution to learn more about data structure utilization and problem-solving in programming.