Threads - Finding the output Questions and Answers

Sample71 is run - what will be the output?

import java.util.*;
import java.util.concurrent.*;

public class Sample71
{
    public static void main(String[] args)
    {
        List<String> names = new CopyOnWriteArrayList<>(Arrays.asList("a", "b"));
        for (String s : names)
        {
            names.add("c");
            System.out.print(s);
        }
        System.out.print(" " + names.size());
    }
}

Sample72 is run - what will be the output?

import java.util.*;

public class Sample72
{
    public static void main(String[] args)
    {
        List<String> names = new ArrayList<>(Arrays.asList("a", "b"));
        for (String s : names)
        {
            names.add("c");
            System.out.print(s);
        }
    }
}

Sample73 is run - what will be the output?

public class Sample73
{
    static final InheritableThreadLocal<String> TAG = new InheritableThreadLocal<>();

    public static void main(String[] args) throws InterruptedException
    {
        TAG.set("parent");
        Thread child = new Thread(() -> System.out.println(TAG.get()));
        child.start();
        child.join();
    }
}

Sample74 is run - what will be the output?

public class Sample74 extends Thread
{
    static final ThreadLocal<String> SCOPE = new ThreadLocal<>();

    public void run()
    {
        System.out.println(SCOPE.get());
    }

    public static void main(String[] args) throws InterruptedException
    {
        SCOPE.set("outer");
        Sample74 worker = new Sample74();
        worker.start();
        worker.join();
    }
}

Sample75 is run - what will be the output?

public class Sample75
{
    public static void main(String[] args)
    {
        Thread t = new Thread();
        t.start();
        System.out.println("done");
    }
}

Sample76 is run - what will be the output?

public class Sample76 extends Thread
{
    public void run()
    {
        System.out.print("body ");
    }

    public static void main(String[] args)
    {
        Sample76 t = new Sample76();
        t.run();
        t.run();
        System.out.print("end");
    }
}

Sample77 is run - what will be the output?

public class Sample77
{
    public static void main(String[] args) throws InterruptedException
    {
        Thread first = new Thread(() -> System.out.print("1"));
        Thread second = new Thread(() -> System.out.print("2"));
        first.start();
        first.join();
        second.start();
        second.join();
        System.out.print("3");
    }
}

Sample78 is run - what will be the output?

public class Sample78
{
    public static void main(String[] args) throws InterruptedException
    {
        Thread t = new Thread(new Runnable()
        {
            public void run()
            {
                System.out.print("x");
            }
        });
        t.setName("printer");
        t.start();
        t.join();
        t.setName("printer");
        System.out.print(" " + t.getName());
    }
}

Sample79 is run - what will be the output?

public class Sample79
{
    public static void main(String[] args) throws InterruptedException
    {
        Thread t = new Thread(() -> System.out.print(
                Thread.currentThread().getPriority()));
        t.start();
        t.join();
    }
}

Sample80 is run - what will be the output?

public class Sample80
{
    public static void main(String[] args) throws InterruptedException
    {
        StringBuilder out = new StringBuilder();
        Thread t = new Thread(() -> out.append("worker"));
        t.start();
        t.join();
        System.out.println(out);
    }
}