Key Area - Memory Mgmt Archives

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01: jvisualvm tutorial to sample Java heap memory

Java does not have a sizeof operator like C++ does. Java uses automatic memory management known as the Garbage Collection, hence it is not that important to evaluate size of…

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02: jvisualvm to detect memory leak – a quick tutorial style Java demo

This is a companion post to 8 Java Memory Management Interview Q&A demonstrating a memory leak scenario step by step with jvisualvm, which is a free profiling tool that gets…

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10: 8 Java Maps & Caching Data in Java Interview Q&As

Q1. What is the purpose of a Map interface in Java collection API? A1. A map is a set of associations between pairs of objects. One is known as a…

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6 Key considerations in processing large files in Java

Q1. What are the key considerations in processing large files?
A1. Before jumping into coding, get the requirements.

#1 Trade-offs among CPU, Memory Usage & Disk I/O

Processing a file involves reading from the disk, processing (e.g. parsing an XML and transforming), and writing back to the disk. It is also a trade off in terms of what is more important to you like having better I/O, better CPU usage, and better memory usage.…

8 Java memory management interview Q&As

Q1. Are memory leaks possible in Java, which has memory management via automatic Garbage Collection? A1. Memory and resource leaks are possible in any robust application. In managed languages such…

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9 Java Garbage Collection interview questions & answers

Java Garbage Collection interview questions & answers to ascertain your depth of Java knowledge in building industry strength Java applications. Determining optimal Garbage Collection (GC) settings is critical to achieve high throughput & low latency.

Q1. In which part of memory does Java Garbage Collection (i.e. GC) occur?…

Java String & Array limitations and OutOfMemoryError

Q1. What is the maximum possible length of a Java String & how much heap space do you need to store the maximum possible String object?
A1. A Java String internally uses a char array (i.e. char[]) and the indices of an array is an integer. The maximum value of an integer is Integer.MAX_VALUE,…

javap, jps, jmap, and jvisualvm tutorial – analyzing the heap histogram

Q1. Is there anything wrong with the code snippet shown below?

public class SumNumbers {

    public static void main(String[] args) throws InterruptedException{
        Integer sum = 0;
        for (int i = 1000; i < 500000; i++) {
            sum += i;
            Thread.sleep(100);
        }
    }
}

public class SumNumbers {

public static void main(String[] args) throws InterruptedException{

Integer sum = 0;

for (int i = 1000; i < 500000; i++) {

sum += i;

Thread.

…

Monitoring/Profiling Java applications interview Q&A

Q1 How will you go about monitoring your Java application for potential performance or memory issues? A1 1. Visual VM for monitoring Java memory, CPU, threads, etc VisualVM is a…

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Blog Archives

01: jvisualvm tutorial to sample Java heap memory

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02: jvisualvm to detect memory leak – a quick tutorial style Java demo

Members Only Content

10: 8 Java Maps & Caching Data in Java Interview Q&As

Members Only Content

6 Key considerations in processing large files in Java

#1 Trade-offs among CPU, Memory Usage & Disk I/O

8 Java memory management interview Q&As

Members Only Content

9 Java Garbage Collection interview questions & answers

Java String & Array limitations and OutOfMemoryError

javap, jps, jmap, and jvisualvm tutorial – analyzing the heap histogram

Monitoring/Profiling Java applications interview Q&A

Members Only Content

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