to be continue...
Ref:https://java2blog.com/java-interview-programs/
Ref:http://www.java2novice.com/java-interview-programs/
Ref:https://javaconceptoftheday.com/java-interview-programs-with-solutions/
Ref:https://www.edureka.co/blog/interview-questions/java-interview-questions/
Ref:https://www.google.com/search?q=java+interview+programming+questions