Mike Savvy

Important test delivery information pertaining to COVID-19 (coronavirus)
Starting Tuesday, March 17, we are suspending test delivery at all U.S.- and Canada-based Pearson VUE-owned test centers for 30 days until April 16.

https://home.pearsonvue.com/coronavirus-update

more information (with countries)

I called Pearson and they cancelled my exam, now I have my voucher again valid and can shedule new exam when this pandemic ends.
This decision about close all test centres is not from Pearson but from government. So maybe in other countries it is still possible to take exam

I do not know, but here in Germany all testing centres (and almost all other things except supermarkts, pharmacies and restaurants) are already closed.
I think for first time until 20 April, later they (government) may extend the time again or may not, depends on corona situation.
The idea behind it that there is a luck in medicine which cant care for very much people at the same time, so they want to slow growth, so that every patient earlier or later has chance to become needed medical treatment

Just got this E-Mail, cant go to my exam this Thursday..

Hello!
Today I developed new program with pandemic simulation, my point was at handling exceptions.
Constructive criticism is welcome  
P.S. I deleted all indents so that the post does not seem too long
Enjoy!
package corona; public class PandemicException extends Exception { private static final long serialVersionUID = 1L; static { System.err.println("Take care of yourself and your family!"); } }
package corona; public class Pandemic { private boolean isPandemic; private String pandemicName; // constructor public Pandemic (String pandemicName, boolean isPandemic) { this.pandemicName = pandemicName; this.isPandemic = isPandemic; } // isPandemic setter public void setPandemic(boolean isPandemic) { this.isPandemic = isPandemic; } // isPandemic getter public boolean isPandemic() { return isPandemic; } // throws exception if isPandemic true public void pandemic() throws PandemicException { if (isPandemic) throw new PandemicException(); } // pandemicName setter public void setPandemicName(String pandemicName) { this.pandemicName = pandemicName; } // String representation of pandemic public String getPandemicName() { return pandemicName; } }
package corona; public class DayOfLife { private String day; private Pandemic currentSituation; // constructor with day string and new pandemic public DayOfLife (String day, Pandemic newPandemic) { this.day = day; currentSituation = newPandemic; } // constructor for case if there is no pandemic public DayOfLife (String day) { this.day = day; currentSituation = new Pandemic("No pandemic", false); } // throws exception if pandemic is true void goToLibrary() { try { currentSituation.pandemic(); System.out.println(currentSituation.getPandemicName() + ", stay to learn in library :)"); } catch (PandemicException pe) { System.out.println("Library is closed due to pandemic " + currentSituation.getPandemicName()); } } // throws exception if pandemic is true void goToSupermarket() { try { currentSituation.pandemic(); System.out.println(currentSituation.getPandemicName() + ", buy all you need :)"); } catch (PandemicException pe){ System.out.println("Deficiency of products due to pandemic " + currentSituation.getPandemicName()); } } // throws exception if pandemic is true void goGym () { try { currentSituation.pandemic(); System.out.println(currentSituation.getPandemicName() + ", stay to excercise in gym :)"); } catch (PandemicException pe){ System.out.println("Gym closed due to pandemic " + currentSituation.getPandemicName()); } } // String representation of this day with current information about pandemic public String toString() { return day + ", " + currentSituation.getPandemicName(); } }
package corona; public class Main { public static void main(String[] args) { // example without pandemic DayOfLife january15 = new DayOfLife("15 January 2020"); live(january15); System.out.println(); Pandemic coronavirus = new Pandemic ("COVID-19", true); // new pandemic // example with pandemic DayOfLife march15 = new DayOfLife("15 March 2020", coronavirus); live(march15); } // prints day info and call methods from DayOfLife class static void live(DayOfLife day) { System.out.println(day.toString()); day.goToLibrary(); day.goToSupermarket(); day.goGym(); } }
    Output:

Would such calculation be correct? I think not because if I have only fever and nothing other it means directly 88% what is not looks like truth

hello!
I want to write a programm which check this symptoms to calculate the probability of corona- infection.

Symptom	%
Fever	87.9%
Dry cough	67.7%
Fatigue	38.1%
Sputum production	33.4%
...	...
Diarrhoea	03.7%
Haemoptysis	00.9%

How it would be correct to calculate it?
Thank you in advance!

Piet Souris and Knute Snortum I am not sure I must know about, since it is not in scope of OCAJ SE8 exam, which I will take this week. But I can back to this suggestions after exam

Okay, I was confused because there is not about lambdas, but about nested classes    Campbell

Campbell Ritchie wrote:Urma Fusco and Mycroft Modern Java in Action (Manning) or Java8 in Action (=same book, older edition).
Java™ Tutorials section.

What do you mean? For CodeRunchUsers?

I have changed so far, but do not really understand what/how exactly CodeRanchUsers class should be? Carey Brown
package superLambdas; import java.util.ArrayList; import java.util.List; import java.util.function.Predicate; public class MyExample { public static void main(String[] args) { List<CodeRanchUser> users = new ArrayList<>(); CodeRanchUser jeanneBoyarsky = new CodeRanchUser("Jeanne Boyarsky", 2003, "author & internet detective"); users.add(jeanneBoyarsky); jeanneBoyarsky.setAuthor(true); users.add(new CodeRanchUser("Campbell Ritchie", 2005, "Marshal")); users.add(new CodeRanchUser("Paul Clapham", 2005, "Marshal")); users.add(new CodeRanchUser("Mike Savvy", 2019, "Ranch Hand" )); print(users, u -> u.isMarshal()); print(users, u -> u.isAuthor()); System.out.println(users.get(3)); System.out.println("Jeanne is an author: "+ users.get(0).isAuthor()); System.out.println("Campbell is a Marshal: " + users.get(1).isMarshal()); System.out.println("my userID: " + users.get(3).getUserID()); System.out.println("Paul is joined: " + users.get(2).getYearJoined()); } /** * check for any trait * @param users - data base of users * @param checker - Predicate */ private static void print(List<CodeRanchUser> users, Predicate<CodeRanchUser>checker) { for (CodeRanchUser user : users) { if (checker.test(user)) System.out.println(user); } } } /** * @author Mihail Savvateev * */ class CodeRanchUser { private static int counterID = 0; private final int userID; private String name; private final int yearJoined; private String post; private boolean isAuthor; /** * @param name * @param yearJoined * @param post */ public CodeRanchUser(String name, int yearJoined, String post) { this.name = name; this.yearJoined = yearJoined; this.post = post; userID = ++counterID; } /** * @return year when this person has joined CodeRanch */ public int getYearJoined() { return yearJoined; } /** * @return ID of this user */ public int getUserID() { return userID; } /** * @return true value if this person is a Marshal */ public boolean isMarshal() { return post.equals("Marshal"); } /** * @return true if this person is an Author */ public boolean isAuthor() { return isAuthor; } /** * String representation of this person (name, post, year) */ public String toString() { return name + ", " + post + ", joined " + yearJoined; } /** * @param name - new name for this person */ public void setName(String name) { this.name = name; } /** * @param post - new post for this person */ public void setPost(String post) { this.post = post; } /** * @param author - set this person author or not author */ public void setAuthor(boolean isAuthor) { this.isAuthor = isAuthor; } }

My new project, I did my best. Critique welcome  

package justOneHundredLinesOfCode; import java.util.ArrayList; import java.util.List; import java.util.function.Predicate; public class MyExample { public static void main(String[] args) { List<CodeRanchUser> users = new ArrayList<CodeRanchUser>(); CodeRanchUser jeanneBoyarsky = new CodeRanchUser("Jeanne Boyarsky", 2003, "author & internet detective"); users.add(jeanneBoyarsky); jeanneBoyarsky.setAuthor(true); users.add(new CodeRanchUser("Campbell Ritchie", 2005, "Marshal")); users.add(new CodeRanchUser("Paul Clapham", 2005, "Marshal")); users.add(new CodeRanchUser("Mike Savvy", 2019, "Ranch Hand" )); print(users, u -> u.isMarshal()); print(users, u -> u.isAuthor()); System.out.println(users.get(3).toString()); System.out.println("Jeanne is an author: "+ users.get(0).isAuthor()); System.out.println("Campbell is a Marshal: " + users.get(1).isMarshal()); System.out.println("my userID: " + users.get(3).getUserID()); System.out.println("Paul is joined: " + users.get(2).yearJoined); } /** * check for any trait * @param users - data base of users * @param checker - Predicate */ private static void print(List<CodeRanchUser> users, Predicate<CodeRanchUser>checker) { for (CodeRanchUser user : users) { if (checker.test(user)) System.out.println(user + " "); } System.out.println(); } } /** * @author Mihail Savvateev */ class CodeRanchUser { private static int ID_COUNTER = 0; public final int userID; private String name; public final int yearJoined; private String post; private boolean author; /** * @param name * @param yearJoined * @param post */ public CodeRanchUser(String name, int yearJoined, String post) { this.name = name; this.yearJoined = yearJoined; this.post = post; userID = ++ID_COUNTER; } /** * @return ID of this user */ public int getUserID() { return userID; } /** * @return true value if this person is a Marshal */ public boolean isMarshal() { return post=="Marshal"; } /** * @return true if this person is an Author */ public boolean isAuthor() { return author; } /** * String representation of this person (name, post, year) */ public String toString() { return name + ", " + post + ", joined " + yearJoined; } /** * @param name - new name for this person */ public void setName(String name) { this.name = name; } /** * @param post - new post for this person */ public void setPost(String post) { this.post = post; } /** * @param author - set this person author or not author */ public void setAuthor(boolean author) { this.author = author; } }

Hello Ian Usher

I’d like to do the 1Z0-809 Programmmer II at some point but it only seems worth doing if I am actually working as a Java developer.

Not necessarily. For the best chance to get the position, do second exam.
First exam is really just about Java Basics, but second show your deep understanding of Java.

Actually I arrived at page 200 in OCA book by Selikoff and Boyarsky, and last page is 332, so there are still more than a hundred. I need a half hour or more time for one page until I understand what is the text about and write examples in Eclipse and check output.
The problem is that I have in exactly one week OCAJ exam, I resheduled it for second time and cant change it more. Also I have enthuware tests but they are so complicate and consume also very much time. I need at least a full day to check all wrong answers.. (60% wrong answers). How can I use this week effectively?
Thank you in advance!

Thank you Gerard Gallant !