Assertions - Finding the output Questions and Answers

The program is run with java -ea Snippet16 - what will be the output?

public class Snippet16
{
    private static int shrink(int n)
    {
        assert n > 0;
        return n - 1;
    }

    public static void main(String[] args)
    {
        try
        {
            shrink(0);
        }
        catch (AssertionError e)
        {
            System.out.println("message: " + e.getMessage());
        }
    }
}

The program is run with java -ea Listing17 - what will be the output?

public class Listing17
{
    public static void main(String[] args)
    {
        try
        {
            assert false;
        }
        finally
        {
            System.out.println("finally");
        }
    }
}

The program is compiled with javac Trial21.java - what is the result?

public class Trial21
{
    static void log() { }

    public static void main(String[] args)
    {
        assert false : log();
    }
}

The program is compiled with javac Case22.java - what is the result?

public class Case22
{
    public static void main(String[] args)
    {
        int assert = 5;
        System.out.println(assert);
    }
}

The program is run with java -ea Sketch23 - what will be the output?

public class Sketch23
{
    public static void main(String[] args)
    {
        Boolean b = null;
        assert b;
        System.out.println("ok");
    }
}

The program is run with java Sample25 - what will be the output?

public class Sample25
{
    static int count = 0;

    static boolean bump() { count++; return true; }

    public static void main(String[] args)
    {
        assert bump();
        System.out.println(count);
    }
}

The program is run with java -ea Probe26 - what will be the output?

import java.util.*;

public class Probe26
{
    static List<String> seen = new ArrayList<String>();

    static boolean record(String s) { seen.add(s); return true; }

    public static void main(String[] args)
    {
        assert record("a");
        assert record("b");
        System.out.println(seen);
    }
}

The program is run with java Demo27 - what will be the output?

import java.util.*;

public class Demo27
{
    public static void main(String[] args)
    {
        List<String> list = new ArrayList<String>();
        list.add("a");
        assert list.remove("a");
        System.out.println(list.size());
    }
}

The program is run with java Snippet28 - what will be the output?

import java.util.*;

public class Snippet28
{
    public static void main(String[] args)
    {
        Map<String, Integer> ages = new HashMap<String, Integer>();
        ages.put("amy", 30);
        Integer gone = ages.remove("amy");
        assert gone != null;
        System.out.println(ages.isEmpty());
    }
}

The program is run with java Listing29 - what will be the output?

public class Listing29
{
    static StringBuilder log = new StringBuilder();

    static boolean note(String s) { log.append(s); return false; }

    public static void main(String[] args)
    {
        assert note("x") : note("y");
        System.out.println(log);
    }
}