public class RuntimeJavaExample{
    public static void main(String args[]) throws Exception {
        Runtime runtime = Runtime.getRuntime();
        
        System.out.println("Present free memory on JVM: "+runtime.freeMemory()+" bytes.");
        
        //Run to increcase free memory of JVM
        runtime.gc();
        System.out.println("After gc method call free memory on JVM: "+runtime.freeMemory()+" bytes.");
        
        System.out.println("Max memory of JVM: "+runtime.maxMemory()+" bytes.");
        System.out.println("Total available memory of JVM: "+runtime.totalMemory()+" bytes.");
    }
}