added Robotexception getLastException

src/main/java/roboter/C3PO.java

@@ -2,6 +2,7 @@ package roboter;
 
 import roboter.exceptions.RobotException;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.stream.Collectors;
 
@@ -9,7 +10,8 @@ public class C3PO implements Robot {
     private int id;
     private String name;
     private boolean isPowerOn=false;
-
+    ArrayList<RobotException> exceptionList=new ArrayList<>();
+    
 public C3PO(int id, String name){
     this.id=id;
     this.name=name;
@@ -42,7 +44,7 @@ public C3PO(int id, String name){
 
     @Override
     public RobotException getLastException() {
-        return null;
+    	return exceptionList.get(exceptionList.size()-1);
     }
 
     @Override

src/main/java/roboter/R2D2.java

@@ -2,6 +2,7 @@ package roboter;
 
 import roboter.exceptions.RobotException;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.stream.Collectors;
 
@@ -9,7 +10,8 @@ public class R2D2 implements Robot {
     private int id;
     private String name;
     private boolean isPowerOn;
-
+    ArrayList<RobotException> exceptionList=new ArrayList<>();
+    
     public R2D2(int id, String name){
         this.id=id;
         this.name=name;
@@ -43,7 +45,7 @@ public class R2D2 implements Robot {
 
     @Override
     public RobotException getLastException() {
-        return null;
+        return exceptionList.get(exceptionList.size()-1);
     }
 
     @Override