Java Intermediate Interview Questions: Part - 2
11. What do we get in the JDK file?
The Java Development Kit (JDK) contains tools needed to develop and run Java programs. It includes the Java Runtime Environment (JRE), the Java compiler, debugging tools, libraries, and documentation necessary for Java development.
12. Explain the distinctions between JVM, JRE, and JDK in Java.
The Java Virtual Machine (JVM) is an abstract machine that enables a computer to run Java programs. The Java Runtime Environment (JRE) consists of the JVM and libraries, essential for running Java applications. The Java Development Kit (JDK) includes the JRE along with development tools, allowing developers to create Java applications.
13. What distinctions exist between HashMap and HashTable in Java?
HashMap is not synchronized and permits null values and one null key, while HashTable is synchronized and does not allow null values or keys. HashMap performs better in most cases unless thread safety is a primary concern.
14. What role does reflection play in Java?
Reflection in Java allows the examination and modification of class structures and behavior at runtime. It enables obtaining information about classes, interfaces, fields, and methods, as well as invoking methods, accessing fields, and creating new instances dynamically.
15. What are the various methods of utilizing threads in Java?
In Java, threads can be created either by extending the Thread class or by implementing the Runnable interface. They can also be managed using Executor Framework, Callable and Future interfaces, or using Java’s synchronized keyword to manage thread safety.
16. Enumerate the different thread priorities in Java. Additionally, what is the default priority assigned to a thread by the JVM?
Thread priorities in Java range from 1 (lowest) to 10 (highest). The default priority assigned by the JVM is 5. Higher priority threads are given preference by the scheduler but are not guaranteed to always execute before lower priority threads.
17. How do you differentiate between a program and a process?
A program is a set of instructions written to perform a specific task when executed, while a process is an instance of a program under execution. Multiple processes can be running for the same program simultaneously.
18. What distinguishes the 'throw' and 'throws' keywords in Java?
‘throw’ is used to explicitly throw an exception within a method, whereas ‘throws’ is used in method signatures to declare the exceptions that the method might throw.
19. Enumerate the differences between a constructor and a method within a class in Java.
Constructors initialize objects and are called implicitly when an object is created, while methods perform specific actions and are called explicitly. Constructors have no return type and have the same name as the class, while methods have a return type (or void for no return) and can have any name.
20. Determine the output of the following Java program and justify your answer.
Unfortunately, I don’t have access to the specific Java program you’re referring to. However, if provided with the code, I could help determine the output by analyzing its logic, identifying any errors, or tracing the execution path through the code.
In conclusion,
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Java Intermediate Interview Questions: Part- 1
