Finished and corrected Version

.idea/libraries/jars.xml

+<component name="libraryTable">
+  <library name="jars">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/jars/hamcrest-core-1.3.jar!/" />
+      <root url="jar://$PROJECT_DIR$/jars/junit-4.12.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="openjdk-17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/GameOfLifeAssignmentNew.iml" filepath="$PROJECT_DIR$/GameOfLifeAssignmentNew.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

GameOfLifeAssignmentNew.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="jars" level="project" />
+  </component>
+</module>

src/Life.java

+//Bearbeitet von: David Papac
+import java.util.Arrays;
 public class Life implements ILife {
-  
+
+  String[] gameWorld;
+
   public static void main(String[] args) {
-    Life l = new Life(new String[] {  "     ",
-                                      "     ",
-                                      " *** ",
-                                      "     ",
-                                      "     " });
+    Life l = new Life( new String[] { "     ",
+            "     ",
+            " *** ",
+            "     ",
+            "     "});
     l = (Life) l.nextGeneration();
-  }
 
+  }
 
   public Life() {
     nukeAll();
+
   }
 
   public Life(String[] setup) {
       for (int x = 0; x < setup[y].length(); x++)
         if (setup[y].charAt(x) != ' ')
           setAlive(x, y);
+
   }
 
 
   @Override
   public void nukeAll() {
     // TODO Auto-generated method stub
+    gameWorld = new String[]{"     ",
+            "     ",
+            "     ",
+            "     ",
+            "     "};
 
   }
 
   @Override
   public void setAlive(int x, int y) {
     // TODO Auto-generated method stub
+    String newString ="";
+    for(int i=0; i< gameWorld[y].length(); i++){
+      if(i==x)
+        newString +='*';
+      else
+        newString += gameWorld[y].charAt(i);
 
+    }
+    gameWorld[y]=newString;
   }
 
   @Override
   public void setDead(int x, int y) {
     // TODO Auto-generated method stub
+    String newString ="";
+    for(int i=0; i< gameWorld[y].length(); i++){
+      if(i==x)
+        newString +=' ';
+      else
+        newString += gameWorld[y].charAt(i);
 
+    }
+    gameWorld[y]=newString;
   }
 
   @Override
   public boolean isAlive(int x, int y) {
     // TODO Auto-generated method stub
-    return false;
-  }
+    if(gameWorld[y].charAt(x) =='*'){
+      return true;}
+    else{
+      return false;
+    }}
 
   @Override
   public ILife nextGeneration() {
     // TODO Auto-generated method stub
-    return null;
+    Life newWorld = new Life();
+    for(int y=0; y< gameWorld.length;y++){
+      for(int x= 0; x <gameWorld[y].length(); x++){
+        int neighbor = countNeighbor(x, y);
+        if(isAlive(x,y)) {
+          if (neighbor == 3 || neighbor == 2) {
+            newWorld.setAlive(x, y);
+          }
+          if (neighbor < 2 || neighbor > 3) {
+            newWorld.setDead(x, y);
+          }
+        }
+        if(!isAlive(x,y)) {
+          if (neighbor == 3) {
+            newWorld.setAlive(x, y);
+          } else {
+            newWorld.setDead(x, y);
+          }
+        }
+      }
+    }
+    newWorld.showBoard();
+    return newWorld;
+  }
+
+  public int countNeighbor(int x, int y) {
+    int counter=0;
+    //counts top row
+    if(y-1 >=0){
+      for(int i =x-1; i<= x+1;i++){
+        if(i>=0 && i< gameWorld[y-1].length()){
+          if(isAlive(i,y-1)){
+            counter++;
+          }
+        }
+      }
+    }
+    //counts bottom row
+    if(y+1 <gameWorld.length){
+      for(int i =x-1; i<= x+1;i++){
+        if(i>=0 && i< gameWorld[y+1].length()){
+          if(isAlive(i,y+1)){
+            counter++;
+          }
+        }
+      }
+    }
+    //counts sides
+    if(x-1>=0){
+      if(isAlive(x-1,y)){
+        counter++;
+      }
+    }
+    if( x+1< gameWorld[y].length()){
+      if(isAlive(x+1,y)){
+        counter++;
+      }
+    }
+    return counter;
+  }
+
+  public void showBoard() {
+    for (int i = 0; i < gameWorld.length; i++)
+      System.out.println(Arrays.toString(new String[]{gameWorld[i]}));
   }
 }

test/LifeTest.java

+//Bearbeitet von: David Papac
 import org.junit.Test;
 import static org.junit.Assert.*;
 
 public class LifeTest {
-    
+
+    @Test
+    public void nuke() {
+        // Arrange: drei lebende Zellen
+        Life l = new Life();
+        l.setAlive(0, 0);
+        l.setAlive(0, 1);
+        l.setAlive(0, 2);
+
+        // Act: Alles wird ausgelöscht
+        l.nukeAll();
+
+        // Assert: Alle Rasterpunkt sterben
+        assertFalse(l.isAlive(0, 1));
+    }
     @Test
     public void createNewCell() {
-        
+
         // Arrange: drei lebende Zellen
         Life l = new Life();
         l.setAlive(0, 0);
 
     @Test
     public void destroyLonelyCell() {
+        // Arrange: drei lebende Zellen
+        Life l = new Life();
+        l.setAlive(0, 0);
+        l.setAlive(0, 1);
+        l.setAlive(0, 2);
+
+        // Act: Berechnung der Folgegeneration
+        ILife nextGen = l.nextGeneration();
+
+        // Assert: Rasterpunkt mit weniger als zwei Nachbarn soll sterben
+        assertFalse(nextGen.isAlive(0, 2));
     }
 
 
     @Test
     public void keepAliveCell() {
+        // Arrange: drei lebende Zellen
+        Life l = new Life();
+        l.setAlive(0, 0);
+        l.setAlive(0, 1);
+        l.setAlive(0, 2);
+
+        // Act: Berechnung der Folgegeneration
+        ILife nextGen = l.nextGeneration();
+
+        // Assert: Rasterpunkt mit mindestens zwei aber weniger als vier Nachbarn soll leben
+        assertTrue(nextGen.isAlive(0, 1));
     }
 
 
     @Test
     public void destroyCrowdedCell() {
+        // Arrange: fünf lebende Zellen
+        Life l = new Life();
+        l.setAlive(0, 0);
+        l.setAlive(0, 1);
+        l.setAlive(0, 2);
+        l.setAlive(1, 1);
+        l.setAlive(1, 0);
+
+        // Act: Berechnung der Folgegeneration
+        ILife nextGen = l.nextGeneration();
+
+        // Assert: Rasterpunkt mit mehr als drei Nachbarn soll sterben
+        assertFalse(nextGen.isAlive(0, 1));
     }
 
 
-}
+}