diff --git a/exercises/concept/annalyns-infiltration/src/main/java/AnnalynsInfiltration.java b/exercises/concept/annalyns-infiltration/src/main/java/AnnalynsInfiltration.java
index 97a724d39..6d5bb7d84 100644
--- a/exercises/concept/annalyns-infiltration/src/main/java/AnnalynsInfiltration.java
+++ b/exercises/concept/annalyns-infiltration/src/main/java/AnnalynsInfiltration.java
@@ -1,17 +1,21 @@
 class AnnalynsInfiltration {
-    public static boolean canFastAttack(boolean knightIsAwake) {
-        throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canFastAttack() method");
+    public static boolean canFastAttack(boolean knightIsAwake){
+        // throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canFastAttack() method");
+        return !knightIsAwake;
     }
 
     public static boolean canSpy(boolean knightIsAwake, boolean archerIsAwake, boolean prisonerIsAwake) {
-        throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canSpy() method");
+        //   throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canSpy() method");
+        return ((knightIsAwake || archerIsAwake) || prisonerIsAwake);
     }
 
     public static boolean canSignalPrisoner(boolean archerIsAwake, boolean prisonerIsAwake) {
-        throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canSignalPrisoner() method");
+        //   throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canSignalPrisoner() method");
+        return !archerIsAwake && prisonerIsAwake;
     }
 
     public static boolean canFreePrisoner(boolean knightIsAwake, boolean archerIsAwake, boolean prisonerIsAwake, boolean petDogIsPresent) {
-        throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canFreePrisoner() method");
+        //     throw new UnsupportedOperationException("Please implement the (static) AnnalynsInfiltration.canFreePrisoner() method");
+        return (prisonerIsAwake && !archerIsAwake && !knightIsAwake) || (!archerIsAwake && petDogIsPresent);
     }
-}
+}
\ No newline at end of file
diff --git a/exercises/concept/bird-watcher/src/main/java/BirdWatcher.java b/exercises/concept/bird-watcher/src/main/java/BirdWatcher.java
index c19dd38e6..23efc7b8f 100644
--- a/exercises/concept/bird-watcher/src/main/java/BirdWatcher.java
+++ b/exercises/concept/bird-watcher/src/main/java/BirdWatcher.java
@@ -7,26 +7,55 @@ public BirdWatcher(int[] birdsPerDay) {
     }
 
     public int[] getLastWeek() {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.getLastWeek() method");
+        //  throw new UnsupportedOperationException("Please implement the BirdWatcher.getLastWeek() method");
+        int[] birdCount = new int[] {0,2,5,3,7,8,4};
+        return birdCount;
     }
 
     public int getToday() {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.getToday() method");
+        //  throw new UnsupportedOperationException("Please implement the BirdWatcher.getToday() method");
+        return birdsPerDay[birdsPerDay.length-1];
     }
 
     public void incrementTodaysCount() {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.incrementTodaysCount() method");
+        ///   throw new UnsupportedOperationException("Please implement the BirdWatcher.incrementTodaysCount() method");
+        birdsPerDay[birdsPerDay.length-1] += 1;
     }
 
     public boolean hasDayWithoutBirds() {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.hasDayWithoutBirds() method");
+        // throw new UnsupportedOperationException("Please implement the BirdWatcher.hasDayWithoutBirds() method");
+        boolean noBird = false;
+        for(int count : birdsPerDay){
+            if (count == 0){
+                noBird = true;
+            }
+
+        }
+        return noBird;
     }
 
     public int getCountForFirstDays(int numberOfDays) {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.getCountForFirstDays() method");
+        //  throw new UnsupportedOperationException("Please implement the BirdWatcher.getCountForFirstDays() method");
+        int getTotalCount=0;
+        if(numberOfDays>birdsPerDay.length){
+            numberOfDays = birdsPerDay.length;
+        }
+        for(int i=0;i<numberOfDays;i++){
+            getTotalCount += birdsPerDay[i];
+        }
+        return getTotalCount;
+
     }
 
     public int getBusyDays() {
-        throw new UnsupportedOperationException("Please implement the BirdWatcher.getBusyDays() method");
+        //     throw new UnsupportedOperationException("Please implement the BirdWatcher.getBusyDays() method");
+
+        int busyDays=0;
+        for (int count : birdsPerDay){
+            if(count >= 5) {
+                busyDays++;
+            }
+        }
+        return busyDays;
     }
-}
+}
\ No newline at end of file
diff --git a/exercises/concept/booking-up-for-beauty/src/main/java/AppointmentScheduler.java b/exercises/concept/booking-up-for-beauty/src/main/java/AppointmentScheduler.java
index e60072f9e..e9fa07023 100644
--- a/exercises/concept/booking-up-for-beauty/src/main/java/AppointmentScheduler.java
+++ b/exercises/concept/booking-up-for-beauty/src/main/java/AppointmentScheduler.java
@@ -1,24 +1,36 @@
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 
 class AppointmentScheduler {
     public LocalDateTime schedule(String appointmentDateDescription) {
-        throw new UnsupportedOperationException("Please implement the AppointmentScheduler.schedule() method");
+        //  throw new UnsupportedOperationException("Please implement the AppointmentScheduler.schedule() method");
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss");
+        LocalDateTime date = LocalDateTime.parse(appointmentDateDescription, formatter);
+
+        DateTimeFormatter printer = DateTimeFormatter.ofPattern("yyyy, MM, dd, HH, mm, ss");
+        printer.format(date);
+        return LocalDateTime.of(date.getYear(), date.getMonth(), date.getDayOfMonth(), date.getHour(), date.getMinute(), date.getSecond());
     }
 
     public boolean hasPassed(LocalDateTime appointmentDate) {
-        throw new UnsupportedOperationException("Please implement the AppointmentScheduler.hasPassed() method");
+        // throw new UnsupportedOperationException("Please implement the AppointmentScheduler.hasPassed() method");
+        return appointmentDate.isBefore(LocalDateTime.now());
     }
 
     public boolean isAfternoonAppointment(LocalDateTime appointmentDate) {
-        throw new UnsupportedOperationException("Please implement the AppointmentScheduler.isAfternoonAppointment() method");
+        //  throw new UnsupportedOperationException("Please implement the AppointmentScheduler.isAfternoonAppointment() method");
+        return appointmentDate.getHour() >= 12 && appointmentDate.getHour() < 18;
     }
 
     public String getDescription(LocalDateTime appointmentDate) {
-        throw new UnsupportedOperationException("Please implement the AppointmentScheduler.getDescription() method");
+        //  throw new UnsupportedOperationException("Please implement the AppointmentScheduler.getDescription() method");
+        DateTimeFormatter printer = DateTimeFormatter.ofPattern("EEEE, MMMM d, yyyy, 'at' h:mm a'.'");
+        return "You have an appointment on "+printer.format(appointmentDate);
     }
 
     public LocalDate getAnniversaryDate() {
-        throw new UnsupportedOperationException("Please implement the AppointmentScheduler.getAnniversaryDate() method");
+        //  throw new UnsupportedOperationException("Please implement the AppointmentScheduler.getAnniversaryDate() method");
+        return LocalDate.of(LocalDate.now().getYear(), 9,15);
     }
 }
diff --git a/exercises/concept/jedliks-toy-car/src/main/java/JedliksToyCar.java b/exercises/concept/jedliks-toy-car/src/main/java/JedliksToyCar.java
index d9906a7b8..0e17182a6 100644
--- a/exercises/concept/jedliks-toy-car/src/main/java/JedliksToyCar.java
+++ b/exercises/concept/jedliks-toy-car/src/main/java/JedliksToyCar.java
@@ -1,17 +1,44 @@
 public class JedliksToyCar {
+    private int distance=0;
+    private int battery=100;
+
     public static JedliksToyCar buy() {
-        throw new UnsupportedOperationException("Please implement the (static) JedliksToyCar.buy()  method");
+        //    throw new UnsupportedOperationException("Please implement the (static) JedliksToyCar.buy()  method");
+        JedliksToyCar car = new JedliksToyCar();
+        return car;
     }
 
     public String distanceDisplay() {
-        throw new UnsupportedOperationException("Please implement the JedliksToyCar.distanceDisplay()  method");
+        //  throw new UnsupportedOperationException("Please implement the JedliksToyCar.distanceDisplay()  method");
+
+
+        String carDistanceDisplay = null;
+        if (this.distance <= 2000) {
+            carDistanceDisplay = "Driven " + this.distance + " meters";
+        }
+        else if(this.distance > 2000) {
+            carDistanceDisplay = "Driven 2000 meters";
+        }
+
+            return carDistanceDisplay;
     }
 
     public String batteryDisplay() {
-        throw new UnsupportedOperationException("Please implement the JedliksToyCar.batteryDisplay()  method");
+      //  throw new UnsupportedOperationException("Please implement the JedliksToyCar.batteryDisplay()  method");
+        String carBatteryDisplay = null;
+        if (this.battery <= 100 && this.battery >= 1) {
+            carBatteryDisplay = "Battery at "+ this.battery +"%";
+        }
+        else if(this.battery <= 0) {
+            carBatteryDisplay = "Battery empty";
+        }
+        return carBatteryDisplay;
     }
 
     public void drive() {
-        throw new UnsupportedOperationException("Please implement the JedliksToyCar.drive()  method");
+        //   throw new UnsupportedOperationException("Please implement the JedliksToyCar.drive()  method");
+        this.distance += 20;
+        this.battery -= 1;
+
     }
 }
diff --git a/exercises/concept/karls-languages/src/main/java/LanguageList.java b/exercises/concept/karls-languages/src/main/java/LanguageList.java
index 0da6b44c7..5cb188f60 100644
--- a/exercises/concept/karls-languages/src/main/java/LanguageList.java
+++ b/exercises/concept/karls-languages/src/main/java/LanguageList.java
@@ -5,30 +5,37 @@ public class LanguageList {
     private final List<String> languages = new ArrayList<>();
 
     public boolean isEmpty() {
-        throw new UnsupportedOperationException("Please implement the isEmpty() method");
+        //throw new UnsupportedOperationException("Please implement the isEmpty() method");
+        return languages.isEmpty();
     }
 
     public void addLanguage(String language) {
-        throw new UnsupportedOperationException("Please implement the addLanguage() method");
+         // throw new UnsupportedOperationException("Please implement the addLanguage() method");
+        languages.add(language);
     }
 
     public void removeLanguage(String language) {
-        throw new UnsupportedOperationException("Please implement the removeLanguage() method");
+      //  throw new UnsupportedOperationException("Please implement the removeLanguage() method");
+        languages.remove(language);
     }
 
     public String firstLanguage() {
-        throw new UnsupportedOperationException("Please implement the firstLanguage() method");
+      //  throw new UnsupportedOperationException("Please implement the firstLanguage() method");
+        return languages.getFirst();
     }
 
     public int count() {
-        throw new UnsupportedOperationException("Please implement the count() method");
+       // throw new UnsupportedOperationException("Please implement the count() method");
+        return languages.size();
     }
 
     public boolean containsLanguage(String language) {
-        throw new UnsupportedOperationException("Please implement the containsLanguage() method");
+       // throw new UnsupportedOperationException("Please implement the containsLanguage() method");
+        return languages.contains(language);
     }
 
     public boolean isExciting() {
-        throw new UnsupportedOperationException("Please implement the isExciting() method");
+        // throw new UnsupportedOperationException("Please implement the isExciting() method");
+     return languages.contains("Java") || languages.contains("Kotlin");
     }
 }
diff --git a/exercises/concept/squeaky-clean/src/main/java/SqueakyClean.java b/exercises/concept/squeaky-clean/src/main/java/SqueakyClean.java
index c56787fab..2a8d51751 100644
--- a/exercises/concept/squeaky-clean/src/main/java/SqueakyClean.java
+++ b/exercises/concept/squeaky-clean/src/main/java/SqueakyClean.java
@@ -1,5 +1,34 @@
 class SqueakyClean {
     static String clean(String identifier) {
-        throw new UnsupportedOperationException("Please implement the (static) SqueakyClean.clean() method");
+     //   throw new UnsupportedOperationException("Please implement the (static) SqueakyClean.clean() method");
+        int index =0;
+        String cleanString = identifier.replace(' ','_');
+        if(cleanString.contains("-")) {
+            index = cleanString.indexOf('-');
+            cleanString = cleanString.replace("-", "");
+            cleanString = cleanString.substring(0,index) + cleanString.substring(index,index+1).toUpperCase() + cleanString.substring(index+1);
+        }
+        char[] chars = cleanString.toCharArray();
+        String newString = "";
+        for(char c : chars) {
+            if(c=='4') c = 'a';
+            else if(c=='3') c = 'e';
+            else if(c=='0') c = 'o';
+            else if(c=='1') c = 'l';
+            else if(c=='7') c = 't';
+
+            newString += c;
+        }
+        cleanString = newString;
+
+        chars = cleanString.toCharArray();
+        newString = "";
+        for(char c : chars) {
+            if(Character.isAlphabetic(c)) newString += c;
+            else if(c=='_') newString += c;
+        }
+        cleanString = newString;
+
+        return cleanString;
     }
 }