diff --git a/src/ILife.java b/src/ILife.java
index 28adbea..2bcd9dd 100644
--- a/src/ILife.java
+++ b/src/ILife.java
@@ -7,8 +7,9 @@ public interface ILife {
 
     // Methoden zum Abfragen der aktuellen Situation
     public boolean isAlive(int x, int y);
+    public boolean isDead(int x, int y);
 
     // Methoden zum Fortschreiben der Generationen
     public ILife nextGeneration();
 
-}
+}
\ No newline at end of file
diff --git a/src/Life.java b/src/Life.java
index 84ab855..2f42fa3 100644
--- a/src/Life.java
+++ b/src/Life.java
@@ -1,23 +1,31 @@
 public class Life implements ILife {
-  
+
+  private final int x_value = 10;
+  private final int y_value = 10;
+
+  public enum CellValue {Dead, Alive}
+  private final CellValue[][] cells = new CellValue[x_value][y_value];
+
   public static void main(String[] args) {
     Life l = new Life(new String[] {  "     ",
-                                      "     ",
-                                      " *** ",
-                                      "     ",
-                                      "     " });
+            "     ",
+            " *** ",
+            "     ",
+            "     " }
+    );
+    l.print();
     l = (Life) l.nextGeneration();
+    l.print();
   }
 
-
   public Life() {
     nukeAll();
   }
 
   public Life(String[] setup) {
     this();
-    for (int y = 0; y < setup.length; y++)
-      for (int x = 0; x < setup[y].length(); x++)
+    for (int y = 0; y < y_value; y ++)
+      for (int x = 0; x < x_value; x ++)
         if (setup[y].charAt(x) != ' ')
           setAlive(x, y);
   }
@@ -26,30 +34,94 @@ public class Life implements ILife {
   @Override
   public void nukeAll() {
     // TODO Auto-generated method stub
-
+    for( int y = 0; y < y_value; y ++){
+      for( int x = 0; x < x_value; x ++){
+        setDead(x,y);
+      }
+    }
   }
 
   @Override
   public void setAlive(int x, int y) {
     // TODO Auto-generated method stub
-
+    cells[x][y] = CellValue.Alive;
   }
 
   @Override
   public void setDead(int x, int y) {
     // TODO Auto-generated method stub
-
+    cells[x][y] = CellValue.Dead;
   }
 
   @Override
   public boolean isAlive(int x, int y) {
     // TODO Auto-generated method stub
-    return false;
+    return cells[x][y] == CellValue.Alive;
+  }
+
+  @Override
+  public boolean isDead(int x, int y) {
+    return cells[x][y] == CellValue.Dead;
   }
 
   @Override
   public ILife nextGeneration() {
     // TODO Auto-generated method stub
-    return null;
+    Life newGeneration = new Life();
+    for (int y = 0; y < y_value; y ++) {
+      for(int x = 0; x < x_value; x ++) {
+        int neighborsAlive = calculateNeighborsAlive(x,y);
+        if(neighborsAlive == 3) {
+          newGeneration.setAlive(x,y);
+        }
+        if(neighborsAlive < 2){
+          newGeneration.setDead(x,y);
+        }
+        if(isAlive(x,y) && (neighborsAlive == 2 || neighborsAlive == 3)){
+          newGeneration.setAlive(x,y);
+        }
+        if(isAlive(x,y) && neighborsAlive > 3) {
+          newGeneration.setDead(x,y);
+        }
+      }
+    }
+    return newGeneration;
+  }
+
+  public void print() {
+    for(int x= 0; x < x_value; x ++) {
+      for(int y = 0; y < y_value; y ++) {
+        if(cells[x][y] == CellValue.Alive) {
+          System.out.print("*");
+        }else{
+          System.out.print(" ");
+        }
+      }
+      System.out.print("\n");
+    }
+  }
+
+  public int calculateNeighborsAlive( int x, int y) {
+    int min_X = x - 1;
+    int max_X = x + 1;
+    int min_Y = y - 1;
+    int max_Y = y + 1;
+
+    if( min_X < 0) min_X = 0;
+    if( max_X >= x_value) max_X = x_value - 1;
+    if( min_Y < 0) min_Y = 0;
+    if( max_Y >= x_value) max_Y = y_value - 1;
+
+    int sum = 0;
+    for(int dx = min_X; dx <= max_X; dx++){
+      for(int dy = min_Y; dy <= max_Y; dy++){
+        if(dx != x || dy != y) {
+          if(cells[dx][dy] == CellValue.Alive ){
+            sum++;
+          }
+        }
+      }
+    }
+    return sum;
   }
 }
\ No newline at end of file
diff --git a/test/LifeTest.java b/test/LifeTest.java
index 3940e66..8d60945 100644
--- a/test/LifeTest.java
+++ b/test/LifeTest.java
@@ -2,37 +2,55 @@ import org.junit.Test;
 import static org.junit.Assert.*;
 
 public class LifeTest {
-    
+
     @Test
     public void createNewCell() {
-        
-        // 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 drei Nachbarn sollte jetzt leben
         assertTrue(nextGen.isAlive(1, 1));
     }
 
-
     @Test
     public void destroyLonelyCell() {
-    }
+        Life firstGen = new Life();
+        firstGen.setAlive(0, 0);
+        firstGen.setAlive(0, 2);
 
+        ILife nextGen = firstGen.nextGeneration();
+
+        assertTrue(nextGen.isDead(0, 0));
+        assertTrue(nextGen.isDead(0, 2));
+    }
 
     @Test
     public void keepAliveCell() {
-    }
+        Life firstGen = new Life();
+        firstGen.setAlive(1, 1);
+        firstGen.setAlive(2, 2);
+        firstGen.setAlive(3, 3);
 
+        ILife nextGen = firstGen.nextGeneration();
+
+        assertTrue(nextGen.isAlive(2, 2));
+    }
 
     @Test
     public void destroyCrowdedCell() {
+        Life firstGen = new Life();
+        firstGen.setAlive(0, 0);
+        firstGen.setAlive(0, 1);
+        firstGen.setAlive(0, 2);
+        firstGen.setAlive(1, 0);
+        firstGen.setAlive(1, 1);
+
+        ILife nextGen = firstGen.nextGeneration();
+
+        assertTrue(nextGen.isDead(0, 1));
+        assertTrue(nextGen.isDead(1, 1));
     }
-
-
-}
+}
\ No newline at end of file