September 2017 Update

Task/100-doors/Java/100-doors-1.java

@@ -1 +1,17 @@
-N.println(IntStream.rangeClosed(1, 100).filter(i -> Math.pow((int) Math.sqrt(i), 2) == i).boxed().join(", ", "Open Doors: ", ""));
+class HundredDoors {
+    public static void main(String[] args) {
+        boolean[] doors = new boolean[101];
+
+        for (int i = 1; i < doors.length; i++) {
+            for (int j = i; j < doors.length; j += i) {
+                doors[j] = !doors[j];
+            }
+        }
+
+        for (int i = 1; i < doors.length; i++) {
+            if (doors[i]) {
+                System.out.printf("Door %d is open.%n", i);
+            }
+        }
+    }
+}

Task/100-doors/Java/100-doors-2.java

@@ -1,13 +1,6 @@
-public class HundredDoors {
+class HundredDoors {
     public static void main(String[] args) {
-        boolean[] doors = new boolean[101];
-        for (int i = 1; i <= 100; i++) {
-            for (int j = i; j <= 100; j++) {
-                if(j % i == 0) doors[j] = !doors[j];
-            }
-        }
-        for (int i = 1; i <= 100; i++) {
-            System.out.printf("Door %d: %s%n", i, doors[i] ? "open" : "closed");
-        }
+        for (int i = 1; i <= 10; i++)
+            System.out.printf("Door %d is open.%n", i * i);
     }
 }

Task/100-doors/Java/100-doors-3.java

@@ -1,11 +1,12 @@
-public class Doors
-{
-	public static void main(String[] args)
-	{
-		boolean[] doors=new boolean[100];
-		for(int i=0;i<10;i++)
-			doors[i*(i+2)]=true;
-		for(int i=0;i<100;i++)
-			System.out.println("Door #"+(i+1)+" is"+(doors[i]?"open.":" closed."));
-	}
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+class HundredDoors {
+    public static void main(String args[]) {
+        String openDoors = IntStream.rangeClosed(1, 100)
+                .filter(i -> Math.pow((int) Math.sqrt(i), 2) == i)
+                .mapToObj(Integer::toString)
+                .collect(Collectors.joining(", "));
+        System.out.printf("Open doors: %s%n", openDoors);
+    }
 }

Task/100-doors/Java/100-doors-4.java

@@ -1,8 +0,0 @@
-public class Doors
-{
-	public static void main(String[] args)
-	{
-		for(int i=0;i<10;i++)
-			System.out.println("Door #"+(i*(i+2)+1)+" is open.");
-	}
-}

Task/100-doors/Java/100-doors-5.java

@@ -1,13 +0,0 @@
-public class Doors
-{
- public static void main(final String[] args)
- {
-  boolean[] doors = new boolean[100];
-
-  for (int pass = 0; pass < 10; pass++)
-   doors[(pass + 1) * (pass + 1) - 1] = true;
-
-  for(int i = 0; i < 100; i++)
-   System.out.println("Door #" + (i + 1) + " is " + (doors[i] ? "open." : "closed."));
- }
-}

Task/100-doors/Java/100-doors-6.java

@@ -1,12 +0,0 @@
-public class Doors
-{
- public static void main(final String[] args)
- {
-  StringBuilder sb = new StringBuilder();
-
-  for (int i = 1; i <= 10; i++)
-   sb.append("Door #").append(i*i).append(" is open\n");
-
-  System.out.println(sb.toString());
- }
-}

Task/100-doors/Java/100-doors-7.java

@@ -1,13 +0,0 @@
-public class Doors{
-   public static void main(String[] args){
-      int i;		
-      for(i = 1; i < 101; i++){
-         double sqrt = Math.sqrt(i);
-         if(sqrt != (int)sqrt){
-            System.out.println("Door " + i + " is closed");
-         }else{
-            System.out.println("Door " + i + " is open");
-         }
-      }
-   } 	
-}