Prev Next


Difference between Stack and Heap memory in Java.

The main difference between heap and stack is that stack memory is used to store local variables and function call while heap memory stores objects in Java.

Each Thread in Java has its own stack whose size can be specified using -Xss JVM parameter, similarly, you can also specify heap size of Java program using JVM option -Xms and -Xmx where -Xms is the starting size of the heap and -Xmx is the maximum size of java heap.

If there is no memory left in the stack for storing function call or local variable, JVM will throw java.lang.StackOverFlowError, while if there is no more heap space for creating an object, JVM will throw java.lang.OutOfMemoryError: Java Heap Space.

Size of stack memory is a lot lesser than the size of heap memory in Java.

Variables stored in the stack are only visible to the owner thread while objects created in the heap are visible to all threads. Stack memory is a private memory of a Java Thread while heap memory is shared among all threads.

Stack memory is used only by one thread of execution.Heap memory is used by all the parts of the application.
Stack memory cannot be accessed by other threads.Objects stored in the heap are globally accessible.
Follows LIFO manner to free memory.Memory management is based on the generation associated with each object.
Exists until the end of execution of the thread.Heap memory lives from the start till the end of application execution.
Stack memory only contains local primitive and reference variables to objects in heap space.Whenever an object is created, it’s always stored in the Heap space.

It's right time to invest in Cryptocurrencies Dogecoin! Earn free bitcoins up to $250 now by signing up.

Earn bitcoins upto $250 (free), invest in other Cryptocurrencies when you signup with blockfi. Use the referral link: Signup now and earn!

Using BlockFi, don't just buy crypto - start earning on it. Open an interest account with up to 8.6% APY, trade currencies, or borrow money without selling your assets.

Join CoinBase! We'll both receive $10 in free Bitcoin when they buy or sell their first $100 on Coinbase! Available in India also. Use the referral Join coinbase!

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.

More Related questions...

Architectural-neutral. Java is Platform independent. Java is Simple. What is High level language? Three flavors of Java. What is Java? Java is object oriented. Difference between JDK, JRE and JVM. Is Java a WORA? Features of Java. (or) Java buzzwords. Interpreted. How many types of memory areas are allocated by JVM? What is the latest version of Java? What is Write Once, Run Anywhere (WORA)? What is a Platform? Is Java a pure/fully object oriented language? Secured. What is bytecode? Portable. Robust. Dynamic. High-performance. Multithreaded. Distributed. What is classloader? Types of classloader. What is Heap space in Java? Default heap size in Java. What is Java Memory Model? What are the new features introduced in Java 8? Difference between EAR, JAR and WAR file in J2EE. Explain memory leak in Java. How Garbage collection works in Java? What are the GC roots in Java? Types of memory leaks in Java. How do you diagonise memory leaks in Java? Difference between Stack and Heap memory in Java. Does Java garbage collector cleans both heap and stack memory? Why garbage collection is required in Java? How GC does not affect Java program's performance? Different categories of GC algorithm. List the available GC algorithms in Java. What is the default GC collector in Java 8? What are types of reference in Java? Explain strong reference type in Java. Explain weak reference type in Java. Explain Serial Garbage Collector in Java. Explain Parallel Garbage Collector in Java. Explain CMS Garbage Collector in Java. Explain G1 Garbage Collector in Java. What is soft reference in Java? What is phantom reference in Java? Explain the javap command in Java. What is PermGen in Java? What is metaspace in JDK 1.8? Explain the usage of MetaspaceSize parameter in Java 8. Difference between permgen and metaspace in Java. New features introduced in Java 1.7. How do I load Jars dynamically at runtime? What is synthetic construct in Java? New changes introduced in Java 9. What is jshell tool in Java 9? Difference between Java.exe and Javaw.exe. What is Nashorn in Java8? How do I debug to see when class is loaded in jvm? Explain Class loading subsystem of JVM. Mention Java features designed to improve application security. Mention few security Libraries that Java platform supports. Mention few advanced coding concepts in Java for security considerations.
Show more question and Answers...

Object, Class and Package

Comments & Discussions