How to find the number of objects in the heap

Question

How can I find the number of live objects on the heap in Java program?

Answer 1

public class NumOfObjects {

    static int count=0;
    {
        count++;
    }
    public static void main(String[] args)
    {
        NumOfObjects no1=new NumOfObjects();
        System.out.println("no1:" + count);//1

        NumOfObjects no2=new NumOfObjects();
        System.out.println("no2:"+ count); //2
        for (int i=0; i<10;i++)
        {
            NumOfObjects noi=new NumOfObjects();    
        }
        System.out.println("Total objects:"+count);// 12 
    }
}