How do I know the memory size in virtual machine?

If you want to know the free memory and the total memory available in the Java runtime environment then you can use the following code snippet to check.

package org.kodejava.example.lang;

public class MemoryExample {
    public static void main(String[] args) {
        long freeMemory = Runtime.getRuntime().freeMemory();
        long totalMemory = Runtime.getRuntime().totalMemory();

        System.out.println("Free Memory  = " + freeMemory);
        System.out.println("Total Memory = " + totalMemory);

Here is the result of the code snippet above:

Free Memory  = 125550264
Total Memory = 128974848

Wayan Saryada

Programmer, runner, recreational diver, currently living in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, Hibernate / JPA.

Leave a Reply