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Ever wondered how Java keeps track of memory usage and cleans up after unused objects? The answer lies in garbage collection, a fundamental Java mechanism that automatically reclaims memory occupied by objects no longer referenced by your program.
Understanding garbage collection is essential for writing efficient and memory-conscious Java applications. This blog post delves into the world of Java garbage collection, exploring when objects become eligible for collection and the different algorithms used by the Java Virtual Machine (JVM) to manage memory.
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Question 1 of 15
1. Question
When does the finalize() method invoked in a program ?
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Question 2 of 15
2. Question
class Sample {
public void method() {
System.out.println(“Garbage is collected”);
}
}
class Main {
public static void main ( String args [ ] )
{
Sample s = new Sample();
Sample object = new Sample();
object.method();
System.gc();
}
}
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Question 3 of 15
3. Question
class GarbageCollection {
public static void main ( String args [ ] )
{
int x = 10;
x = 5;
System.out.println(x);
}
}
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Question 4 of 15
4. Question
Which of the following methods is used to invoke a garbage collector in Java ?
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Question 5 of 15
5. Question
class GarbageDemo {
public void function()
{
int a , b , c;
a = 5;
b = 10;
c = null;
System.out.println(a+b);
}
}
class Main {
public static void main ( String args [ ] )
{
GarbageDemo g = new GarbageDemo();
g.function();
}
}
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Question 6 of 15
6. Question
class Sample {
public static void main ( String args [ ] )
{
int x = 10;
x = x + x;
System.out.println(x);
System.gc();
}
}
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Question 7 of 15
7. Question
Which of the following cannot be garbage collected ?
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Question 8 of 15
8. Question
class One {
public void method()
{
System.out.println(“DataFlair”);
}
}
class Main {
public static void main ( String args [ ] )
{
void display()
{
One o = new One();
o.method();
}
System.gc();
System.out.println(“Garbage is collected”);
}
}
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Question 9 of 15
9. Question
class Example {
public void Display()
{
System.out.println(“Finalize method is executed”);
}
}
class Main {
public static void main ( String args [ ] )
{
Example e = new Example();
e.Display();
System.gc();
}
void finalize() {
}
}
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Question 10 of 15
10. Question
Which of the following is not an advantage of Garbage collection ?
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Question 11 of 15
11. Question
class GarbageCollection {
public static void main ( String args [ ] )
{
int a ;
System.out.println(a);
}
}
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Question 12 of 15
12. Question
class Function {
public static void main ( String args [ ] )
{
System.out.println(“DataFlair”);
}
garbageCollector();
}
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Question 13 of 15
13. Question
Which of the following is used to collect unused objects in Java ?
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Question 14 of 15
14. Question
class Average {
public void calculate ( int a , int b , int c )
{
int avr = ( a + b + c ) / 3 ;
}
}
class Main {
public static void main ( String args [ ] )
{
Average a = new Average();
a.calculate();
System.gc();
}
void finalize() {
}
}
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Question 15 of 15
15. Question
class Main {
public static void main ( String args [ ] )
{
String a;
String b;
a = “DataFlair”;
void print() {
System.out.println(a);
}
System.gc();
System.out.println(b);
}
}
CorrectIncorrect
Summary:
This quiz has provided a foundational understanding of Java garbage collection. We explored the concept of object reachability and how it determines when an object becomes garbage. We also examined the different garbage collection algorithms commonly used by the JVM, including mark-and-sweep, copying, and generational collection.
By equipping yourself with this knowledge, you can write more efficient Java code that minimizes memory usage and optimizes application performance.
This quiz also serves as a springboard for further exploration. Consider delving deeper into specific garbage collection algorithms and how to fine-tune them for your application’s unique needs. Additionally, explore tools and techniques for monitoring memory usage and identifying potential memory leaks in your Java programs.