Java Runtime freeMemory() Method

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Description

The Java Runtime freeMemory() method returns the amount of free memory in the Java Virtual Machine. Calling the gc method may result in increasing the value returned by freeMemory.

Declaration

Following is the declaration for java.lang.Runtime.freeMemory() method

public long freeMemory()

Parameters

NA

Return Value

This method returns an approximation to the total amount of memory currently available for future allocated objects, measured in bytes.

Exception

NA

Example: Getting Free Memory of current Environment in Bytes

The following example shows the usage of Java Runtime freeMemory() method. We've printed the free memory of the current environment using freeMemory() method.

package com.tutorialspoint;

public class RuntimeDemo {

   public static void main(String[] args) {

      // print when the program starts
      System.out.println("Program starting...");

      // print the number of free bytes
      System.out.println(Runtime.getRuntime().freeMemory());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Program starting...
62780856