Java-coding Problems Pdf Github Jun 2026

Do you have a favorite GitHub repository for Java practice? Share it in the comments below (or contribute to the repo mentioned above). Happy coding!

// Solution List<String> list = new ArrayList<>(); list.add("A"); list.add("B"); Iterator<String> iterator = list.iterator(); while (iterator.hasNext()) String str = iterator.next(); if (str.equals("A")) iterator.remove(); java-coding problems pdf github

public int[] twoSum(int[] nums, int target) Map<Integer, Integer> map = new HashMap<>(); for (int i = 0; i < nums.length; i++) int complement = target - nums[i]; if (map.containsKey(complement)) return new int[] map.get(complement), i ; Do you have a favorite GitHub repository for Java practice

For every problem you find on GitHub, ask yourself: "Can I make this faster?" and "How much memory is this using?" list = new ArrayList&lt