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01: Java data types interview Q&A

Q1. How would you go about choosing the right data types for your application? A1. Java is what is … … Read more ›...

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02: 10 Java String class interview Q&As

Java Collection interview questions and answers and Java String class interview questions and answers are must know for any Java developer …

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03: Java autoboxing & unboxing benefits & caveats interview Q&As

Q1. What do you understand by the terms “autoboxing” and “autounboxing” in Java? A1. Java automatically converts a primitive type like … … Read more ›...

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04: Java primitives & objects memory consumption

Q1. How much memory space does a primitive type int occupy in Java? A1. 4 bytes. Q2. Java … … Read more ›...

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05: Java Date and Time Interview Q&As

Q1. What is wrong with old Java.util.Date & java.util.Calendar/java.sql.* APIs and why should joda-time & Java 8 libraries favored? A1. Old… … Read more ›...

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06: Understanding TimeZones with Java 8 examples

What is UTC? which stands for Coordinated Universal Time. The diagram below shows the standard time offsets of different countries. …

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Convert Java Date/Time to String & String back to Date/Time

#1. Why convert a Date to String & a String back to Date

(a) Convert a String input from say a …

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Converting String to Amount and Amount to String

#1. Does Java have a “Money” class? No. This will change in Java 9 with the “Money API”. JSR 354 defines … … Read more ›...

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Generating a UUID (aka GUID) in Java

UUID stands for Universally Unique ID. A UUID is known in the Microsoft world as as a GUID.

What does …

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