Q1 What do you understand by the term type erasure with regards to generics? A1. The term type erasure is used in Java generics. In the interest of backward compatibility, robustness of generics has been sacrificed through type erasure. Type erasure takes place at compile-time. … Read more ›...
7 Things you must know about Java locks and synchronized key word summarizes the key basics. #1. Each Java class and object (i.e. instance of a class) has an intrinsic lock or monitor. Don’t confuse this with explicit lock utility class that were added in Java 1.5, … Read more...
Q1. How will you go about explaining the following Java concepts to a beginner who is starting to learn Java? 1. Process Vs Threads 2. Heap versus Stack 3. Local variables versus instance variables 4. How do threads communicate with each other? 5. … Read more ›...
Q1. What do you understand by the terms “autoboxing” and “autounboxing” in Java? A1. Java automatically converts a primitive type like “int” into corresponding wrapper object class Integer. This is known as the autoboxing. When it converts a wrapper object class Integer back to its primitive type “int”, … Read...
FP – calculate the invoice price Invoice Price = (markedPrice * (100 – discountRate)/100) + deliveryCharge Example
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package com.fp.eg3; import java.util.function.Function; public class DiscountCalcFPMain { public static void main(String[] args) { double markedPrice = 300.00; double discountRate = 10.00 ; //10% double deliveryCharge = 50.00; DiscountCalaculator dc = new DiscountCalaculator(); Function<Double, Double> f = dc.currySecondArg((100 - discountRate)/100); Function<Double, Double> g = x -> x + deliveryCharge; Function<Double, Double> h = f.andThen(g); System.out.println("Invoice Price = " + h.apply(markedPrice)); // 320.00 } } |
“f.andThen(g)” is the composition of functions. This can be described as g(f()) where f() is 270.0 (i.e. 300.00 * (100 – … Read more ›...
The functional interfaces and Lambda expressions are going to make your code concise when coding with Java 8. These are the most awaited features among Java developers. If you understand the following examples, you will know what a lambda expression is & … Read more ›...
This assumes that you have read the basics on Java GC at Java Garbage Collection interview Q&A to ascertain your depth of Java knowledge. This is a must know topic for those who like to work on low latency applications. Q1. In what ways does GC impact latency and throughput...
Polymorphism is the ability of a class instance to behave as if it were an instance of another class in its inheritance tree, most often one of its ancestor classes. Overriding is the means by which you achieve polymorphism. Java Polymorphism vs Overriding vs Overloading explained in detail to handle drill down Java OOP interview questions with ease when quizzed further.
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Q1. What are the different binary tree traversal mechanisms? A1. Traversing a tree means visiting all the nodes of a tree in order. Many different binary tree algorithms involve traversals. For example, if you wish to count the number of employees in an organizational chart you must visit each node....
Q1. Have you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? A1. If you are applying for such jobs, you can be quizzed on Big O notation. Here are some basics to brush up on. … Read more ›...
Q1. If java.lang.Object is the super type for java.lang.Number and, Number is the super type for java.lang.Integer, am I correct in saying that List<Object> is the super type for List<number> and, … Read more ›...
Q1. Why do threads need to communicate with each other? A1. Inter thread communication is very similar to inter process communication where 2 or more processes communicate with other, the only difference being that inter thread communication happens within the same process (i.e. within the same memory model). … Read...
Q1. When is an object needs to implement the Comparable interface? a) When adding it to a HashSet. b) When adding it to a TreeSet. c) When adding it to a LinkedHashSet. … Read more ›...
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