Book Image

Mastering the Java Virtual Machine

By : Otavio Santana
Book Image

Mastering the Java Virtual Machine

By: Otavio Santana

Overview of this book

Mastering the Java Virtual Machine is a comprehensive guide that will take you into the heart of Java programming, guiding you through the intricate workings of the Java Virtual Machine (JVM) and equipping you with essential skills to become a proficient Java developer. You’ll start by understanding the JVM, exploring its architecture and how it executes Java code. Through detailed explanations and real-world examples, you’ll gain a deep understanding of JVM internals, enabling you to write efficient and optimized Java applications. As you progress, you’ll delve into memory management and execution, unraveling the complexities of heap and stack management, garbage collection, and memory profiling. You'll learn how memory is allocated and reclaimed in the JVM, as well as how to optimize memory usage and identify performance bottlenecks in your applications. With this knowledge, you’ll be able to create Java programs that are not only robust but also highly performant. By the end of this book, you’ll have the skills needed to excel in Java programming, writing efficient, maintainable code.
Table of Contents (19 chapters)
Free Chapter
1
Part 1: Understanding the JVM
5
Part 2: Memory Management and Execution
9
Part 3: Alternative JVMs
12
Part 4: Advanced Java Topics

Questions

Answer the following questions to test your knowledge of this chapter:

  1. Which bytecode instruction is used to compare if two integers are equal and branch accordingly?
    1. ifeq
    2. if_icmpeq
    3. if_acmpeq
    4. tableswitch
  2. What does the bytecode instruction ifeq do?
    1. Branches if the top value on the stack is equal to 0
    2. Branches if two integers on the stack are equal
    3. Jumps to a subroutine
    4. Loads an integer from an array
  3. Which bytecode instruction is used for unconditional branching?
    1. goto
    2. ifne
    3. jsr_w
    4. lookupswitch
  4. In Java bytecode, what does the jsr instruction do?
    1. Jumps to a subroutine
    2. Calls a static method
    3. Compares two doubles
    4. Branches if the top value on the stack is null
  5. Which bytecode instruction is used to check if two object references are not equal and branches to the target instruction?
    1. if_acmpeq
    2. if_acmpne
    3. ifnull
    4. goto_w