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Java basics

freeMemory()

The java.lang.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.

Syntax:

public long freeMemory()

Example:

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());

   }
}

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