How to increase Heap size in java

Run the following program

 

class HeapEx{
 public static void main(String args[]){
  HeapEx obj[] = new HeapEx[100000000];
  
  for(int i=0; i<100000000; i++)
   obj[i] = new HeapEx();
   
  System.out.println("I am done");
 }
}

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

at HeapEx.main(HeapEx.java:8)

OutOfMemoryError thrown when the Java Virtual Machine unable to allocate memory for an object, and no more memory could be made available by the garbage collector.

To Increase the heap size, java provides an option -Xmx

Option	Description
-Xms	Set initial and minimum heap size
-Xmx	Set maximum heap size

The JVM heap can vary its Current heap size between two preconfigured memory boundaries – the initial heap size (defined by the –Xms option) and the maximum heap size (defined by the –Xmx option)

Syntax

-Xms<size>[g|G|m|M|k|K]

-Xmx<size>[g|G|m|M|k|K]

To make the above program run, I increased the size of heap memory to 5000mb like below

java -Xmx5000M HeapEx

Output

I am done

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