Memory Management in java: Object Creation and Garbage Collection

     Memory plays a vital role in programming. Any objects, variables need memory to store its value. Generally, memory management involves the allocation and deallocation of memory space.

The memory areas in java can be classified into 4 types listed as follows.

• ·       Heap Memory: It stores the objects and variables.
• ·       Stack Memory: Method calls and local variables.
• ·       Code (Method) Area: byte codes of methods and constructors are stored.
• ·       Native Method Stack: It has Native Method information.

Some of the concepts in memory management are given below.

• ·       Object Creation and Garbage Collection
• ·       Detecting Memory Leak
• ·       Using Weak References

Let us implement these concepts in Java.

Java Program to implement Object Creation and Garbage Collection:

This program illustrates the object creation and garbage collection.

Steps:

• ·       First, a class is created with main() function.
• ·       A loop is created with condition i<10. Until this condition fails, the process is repeated.
• ·       A string is created an object “temp”.
• ·       It holds the integer value and an output statement is printing this object value.
• ·       As it is a temporary value, it is garbage collected at the end.

Program:

public class MemoryMgtEg {

    public static void main(String[] args) {

        System.out.println("The string created its object");

        for (int i = 0; i < 10; i++) {

            String temp = new String("String number: " + i);

            System.out.println(temp);

            }

        System.out.println("The garbage collection is done.");

    }

}

Output:

When you compile and execute this program, you get the output as follows…

C:\raji\blog>javac MemoryMgtEg.java

C:\raji\blog>java MemoryMgtEg

The string created its object

String number: 0

String number: 1

String number: 2

String number: 3

String number: 4

String number: 5

String number: 6

String number: 7

String number: 8

String number: 9

The garbage collection is done.

This is the way of implementing the java program to illustrate the object creation and garbage collection. Hope this will be useful for you.Keep coding!!!