GitHub

Java Coding Problems

public Map<Character, Integer> countDuplicateCharacters(String str) { Map<Character, Integer> result = new HashMap<>(); // or use for(char ch: str.toCharArray ...
GitHub

Java 8 Interview Sample Coding Questions [Solution Improvement in progress]

Given a list of integers, write a Java 8 program to separate the odd and even numbers into two separate lists. Remove duplicate elements from a list using Java 8 streams Write a Java 8 program to ...
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[Java Silver SE 17] Organizing the differences between == and equals() | A story about stumbling over String comparisons

I have decided to resume my studies for the Java Silver SE 17 exam little by little. I have studied this before, but I do not fully understand all the basics of Java. Since I am at it, I would like to ...
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Oracle Certified Java Gold SE 17 Study Guide | Basic Review Before Gold Study (1): Types, Strings, and Dates via 60 Original Multiple-Choice Questions

A comprehensive check of the basics for Oracle Certified Java Gold SE 17—Part 1: Types, Strings, and Dates—using topic-specific questions before starting Gold-level study. When studying for the Oracle ...