UE14

src/UE14_130225_Streams/UE14_Streams.java

@@ -1,16 +1,47 @@
 package UE14_130225_Streams;
 
+import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.IntStream;
 
 public class UE14_Streams {
     public static void main(String[] args) {
-//        zahlenreihen();
-//        printFolgeOhne3(1);
-//        printFolgeOhne3(5);
-//        printFolgeOhne3(10);
-//        printFolgeOhne3(20);
-        wuerfelStatistik(6);
+        zahlenreihen();
+
+        printFolgeOhne3(1);
+        printFolgeOhne3(5);
+        printFolgeOhne3(10);
+        printFolgeOhne3(20);
+
+        for (int i = 1; i <= 6; i++) wuerfelStatistik(i);
+
+        for (int i = 0; i <= 100; i++) alleTeiler(i);
+
+        for (int i = 0; i <= 100; i++)
+            if (istPrimzahl(i)) System.out.println(i + ": is a Prime Number");
+            else System.out.println(i + ": is NOT Prime Number");
+
+        for (int i = 0; i <= 10; i++) System.out.println(i + ": " + gaussSumme(i));
+
+        verticalString("Hallo");
+        verticalString("Hallo!!!");
+        verticalString("a(&\t/'?%\n§''%Z??/§$%");
+
+        mitStern("Hallo");
+        System.out.println();
+        mitStern("Hallo!!!");
+        System.out.println();
+        mitStern("a(&/'?%§''%Z??/§$%");
+        System.out.println();
+
+        deleteBlanks("Hallo Welt wie gehts");
+        System.out.println();
+
+        System.out.println(enthaeltZiffern("Hallo 3AI"));
+        System.out.println(enthaeltZiffern("Hallo Welt"));
+        System.out.println(enthaeltZiffern("0"));
+        System.out.println(enthaeltZiffern("A"));
+        System.out.println(enthaeltZiffern(""));
     }
 
     public static void zahlenreihen() {
@@ -33,25 +64,35 @@ public class UE14_Streams {
     }
 
     public static void wuerfelStatistik(int augenzahl) {
+        System.out.println(augenzahl + ": " + new Random().ints(1000, 1, 7).filter(n -> n == augenzahl).count());
     }
 
     public static void alleTeiler(int z) {
+        System.out.println(z + ": " + IntStream.rangeClosed(1, z).filter(n -> z % n == 0).mapToObj(String::valueOf).reduce((a, b) -> a + ", " + b).orElse(""));
     }
 
     public static boolean istPrimzahl(int z) {
-        return true;
+//        return z > 1 && IntStream.rangeClosed(2, z).filter(n -> z % n == 0).count() == 1;
+        return z > 1 && IntStream.rangeClosed(2, (int) Math.sqrt(z)).allMatch(n -> z % n != 0); // More Efficient (from 10-12ms to 5-8ms)
     }
 
     public static int gaussSumme(int n) {
-        return 0;
+        return IntStream.rangeClosed(1, n).sum();
     }
 
     public static void verticalString(String s) {
+        s.chars().forEach(c -> System.out.println((char) c));
     }
 
     public static void mitStern(String s) {
+        s.chars().forEach(c -> System.out.print((char) c + "*"));
     }
 
     public static void deleteBlanks(String s1) {
+        s1.chars().filter(c -> c != ' ').forEach(c -> System.out.print((char) c));
+    }
+
+    public static boolean enthaeltZiffern(String s) {
+        return s.chars().filter(Character::isDigit).findAny().isPresent();
     }
 }