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♥♦ Q1-Q10: Top 50+ Core Java Interview Questions & Answers

Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects? A1. When you use “==” (i.e. shallow comparison), you are actually comparing the two object references to see if they point to the same object. When you use “equals(…)”, which is a “deep comparison” that compares

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♦ Q11-Q23: Top 50+ Core on Java OOP Interview Questions & Answers

The focus is on Java OOP interview questions and answers. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q24-Q36 on classes, interfaces and generics | Q37-Q42 on GC and referencing | Q43-Q54 on Objects Q11. What is the difference between constructors and other regular methods? A11. Constructors must have…...

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♦ Q43-Q54: Top 50+ Core on Java Objects Interview Questions & Answers

FAQ interview questions answered on Java objects. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP | Q24-Q36 on classes, interfaces and generics | Q37-Q42 on GC and referencing Q43. What can you tell about the performance of a HashMap compared to a TreeMap? Which one would…...

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♦ Q37-Q42: Top 50+ Core on Java Garbage Collection Interview Questions & Answers

As a Java developer, you may not need to know how the JVM works, but the most important topic that you must know is Java Garbage Collection. How the Garbage Collection and object referencing work in Java. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP |…...

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♦ Q24-Q36: Top 50+ Core on Java classes, interfaces and generics interview questions & answers

Focus is on Java classes, interfaces and generics the interview questions and answers style. Java classes and interfaces are the building blocks. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP | Q37-Q42 on GC and referencing | Q43-Q54 on Objects Q24. What happens when a parent…...

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04: ♦ Top 10 most common Core Java beginner mistakes

Mistake #1: Using floating point data types like float or double for monetary calculations. This can lead to rounding issues.

In the above code, 2, 4, and 5 are correct and 1 and 3 are incorrect usage leading to rounding issues. So, either use BigDecimal properly as shown in 2…...

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Java 7: Top 8 new features with examples

There are several small new features and enhancements in Java 7. The major features and enhancements are in Java 8. Let’s look at the Java 7 new features. #1: string in switch statement:

Output is:

#2 Binary integral literals

Output:

#3: Underscores for better readability in…...

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03: ♦ 9 Core Java Concepts you can’t afford to not know

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. Are Java methods reentrant? 6. Does Java…...

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