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When jvm starts up, which thread will be started up first?

+1 vote
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When jvm starts up, which thread will be started up first?
posted Jan 18, 2017 by Karthick.c

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1 Answer

+1 vote

When jvm starts up the thread executing main method is started.

answer Feb 8, 2017 by Manisha
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Java: After locking of first thread how other thread are accessing the list? 
import java.util.ArrayList;
import java.util.List;

public class ThreadB extends Thread {
    private static List<String> list1   = new ArrayList<String>();
    private static List<String> list2   = new ArrayList<String>();
    private static final Object mutex   = new Object();

    public void run() {
        try {
            sleep(2000l);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        synchronized (mutex) {
            list1.add("Hello");
            System.out.println("Added for 1   " + list1.size());
            list2.add("Added for 2");
            System.out.println("Added for 2   " + list2.size());
            mutex.notify();
        }
    }

    public static void main(String[] args) {
        ThreadB a1 = new ThreadB();
        ThreadB a2 = new ThreadB();
        a1.start();
        a2.start();
        new ThreadB().m1();    
    }

    private void m1() {         
        synchronized (list1) {
            System.out.println(list1.size());
            System.out.println(list2.size());
            try {
                list1.add("hello");
                System.out.println("m1  :::   " + list1.size());
                sleep(5000l);
                System.out.println("Oh mY God");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    }
}

Output is 

0
0
m1  :::   1
Added for 1   2
Added for 2   1
Added for 1   3
Added for 2   2
Oh mY God

After locking list1, how other threads are going to access that list?

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When does static inner class get loaded into the JVM memory?

I was playing around some static inner class.

    package com.tutorial; 
    public class MyUpperClass {
        private MyUpperClass () {

        }
        private static class MyStaticInnerClass{
                    private static final MyUpperClass muc = new MyUpperClass ();
        }
        public static MyUpperClass getInstance() {
            return MyStaticInnerClass.muc;
        }
    }

Now, My question is, when does MystaticInnerClass get loaded into the JVM memory?
At the time of, when MyUpperClass get loaded or getInstance() get called?

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