guess what works now, fker:)

.idea/workspace.xml

@@ -4,10 +4,10 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="f5e08808-a5af-4c89-a1ee-21b3bcb9ae3e" name="Changes" comment="changed nfaAddTrap, bei dem Fall, dass Transition.readSymbol() einen nullwert zurückgibt. (Thx ChatGBT)&#10;-&gt; intersectionTests funktionieren">
+    <list default="true" id="f5e08808-a5af-4c89-a1ee-21b3bcb9ae3e" name="Changes" comment="isFinite methode recursiv...">
-      <change afterPath="$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/Tuple.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/NFAImpl.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/NFAImpl.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/Tuple.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/Tuple.java" afterDir="false" />
     </list>
     <list id="39d4ccb3-eae9-4ed4-996a-5a13f44678fa" name="Changes by carol" comment="" />
     <option name="SHOW_DIALOG" value="false" />
@@ -60,6 +60,8 @@
   <component name="PropertiesComponent"><![CDATA[{
   "keyToString": {
     "JUnit.ComplexTests.executor": "Run",
+    "JUnit.ComplexTests.finite1Test.executor": "Run",
+    "JUnit.ComplexTests.finite2Test.executor": "Debug",
     "JUnit.ComplexTests.intersection1Test.executor": "Run",
     "JUnit.ComplexTests.intersection2Test.executor": "Run",
     "JUnit.myTests.intersection1Test.executor": "Run",
@@ -97,6 +99,38 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
+    <configuration name="ComplexTests.finite1Test" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="ETI_Abgabe" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="ab1.tests.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="ab1.tests" />
+      <option name="MAIN_CLASS_NAME" value="ab1.tests.ComplexTests" />
+      <option name="METHOD_NAME" value="finite1Test" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="ComplexTests.finite2Test" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="ETI_Abgabe" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="ab1.tests.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="ab1.tests" />
+      <option name="MAIN_CLASS_NAME" value="ab1.tests.ComplexTests" />
+      <option name="METHOD_NAME" value="finite2Test" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
     <configuration name="ComplexTests.intersection1Test" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="ETI_Abgabe" />
       <extension name="coverage">
@@ -129,30 +163,6 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="ab1 in ETI_Abgabe" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="ETI_Abgabe" />
-      <option name="TEST_OBJECT" value="directory" />
-      <dir value="$PROJECT_DIR$/src/test/java/ab1" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="myTests.intersection1Test" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="ETI_Abgabe" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="ab1.tests.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <option name="PACKAGE_NAME" value="ab1.tests" />
-      <option name="MAIN_CLASS_NAME" value="ab1.tests.myTests" />
-      <option name="METHOD_NAME" value="intersection1Test" />
-      <option name="TEST_OBJECT" value="method" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
     <configuration default="true" type="JetRunConfigurationType">
       <method v="2">
         <option name="Make" enabled="true" />
@@ -167,10 +177,10 @@
     <recent_temporary>
       <list>
         <item itemvalue="JUnit.ComplexTests" />
+        <item itemvalue="JUnit.ComplexTests.finite2Test" />
+        <item itemvalue="JUnit.ComplexTests.finite1Test" />
         <item itemvalue="JUnit.ComplexTests.intersection2Test" />
         <item itemvalue="JUnit.ComplexTests.intersection1Test" />
-        <item itemvalue="JUnit.myTests.intersection1Test" />
-        <item itemvalue="JUnit.ab1 in ETI_Abgabe" />
       </list>
     </recent_temporary>
   </component>
@@ -258,7 +268,15 @@
       <option name="project" value="LOCAL" />
       <updated>1704819635241</updated>
     </task>
-    <option name="localTasksCounter" value="9" />
+    <task id="LOCAL-00009" summary="isFinite methode recursiv...">
+      <option name="closed" value="true" />
+      <created>1704888180654</created>
+      <option name="number" value="00009" />
+      <option name="presentableId" value="LOCAL-00009" />
+      <option name="project" value="LOCAL" />
+      <updated>1704888180655</updated>
+    </task>
+    <option name="localTasksCounter" value="10" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -282,21 +300,27 @@
     <MESSAGE value="fucking hell" />
     <MESSAGE value="concat GEHT" />
     <MESSAGE value="changed nfaAddTrap, bei dem Fall, dass Transition.readSymbol() einen nullwert zurückgibt. (Thx ChatGBT)&#10;-&gt; intersectionTests funktionieren" />
-    <option name="LAST_COMMIT_MESSAGE" value="changed nfaAddTrap, bei dem Fall, dass Transition.readSymbol() einen nullwert zurückgibt. (Thx ChatGBT)&#10;-&gt; intersectionTests funktionieren" />
+    <MESSAGE value="isFinite methode recursiv..." />
+    <option name="LAST_COMMIT_MESSAGE" value="isFinite methode recursiv..." />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
       <breakpoints>
         <line-breakpoint enabled="true" type="java-line">
           <url>file://$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/NFAImpl.java</url>
-          <line>343</line>
+          <line>344</line>
           <option name="timeStamp" value="44" />
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
           <url>file://$PROJECT_DIR$/src/main/java/ab1/impl/GRUPPE/NFAImpl.java</url>
-          <line>355</line>
+          <line>356</line>
           <option name="timeStamp" value="53" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="java-line">
+          <url>file://$PROJECT_DIR$/src/test/java/ab1/tests/ComplexTests.java</url>
+          <line>141</line>
+          <option name="timeStamp" value="59" />
+        </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
     <watches-manager>
@@ -304,6 +328,7 @@
         <watch expression="((HashSet)((NFAImpl)testInstance).acceptingStates).toArray()[2]" custom="java.util.HashSet,ab1.impl.GRUPPE.NFAImpl" />
         <watch expression="transition.readSymbol()" />
         <watch expression="transition.readSymbol()==letter" />
+        <watch expression="transitions.get(i)" />
       </configuration>
     </watches-manager>
   </component>

src/main/java/ab1/impl/GRUPPE/NFAImpl.java

@@ -5,6 +5,7 @@ import ab1.NFA;
 import ab1.Transition;
 
 import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
 
 public class NFAImpl implements NFA {
     private final Set<String> states;
@@ -385,49 +386,61 @@ public class NFAImpl implements NFA {
 
         List<Tuple> path = new ArrayList<>();
         List<Transition> transitions= new ArrayList<>(this.getTransitions());
-        //int finished = 0; //0=unfinished, 1=finite, 2 = infinite
+        AtomicInteger finished = new AtomicInteger(0); //0=unfinished, 1=finite, 2 = infinite
         List<Character> letters = new ArrayList<>(this.alphabet); // letters is alphabet with epsilon (null)
-        if(!letters.contains(null)) {
-            letters.add(null);
-        }
         if(this.alphabet.isEmpty()){
             return true;
         }
-        // EndTuple hast firstElement = a
+        if(!letters.contains(null)) {
-        path.add(new Tuple('a', this.initialState, true));
+            letters.add(null);
-        if(fillToEnd(path, transitions, letters)){
-            return true;
         }
 
-
+        // EndTuple hast firstElement = a //doesn´t matter at all aktually
-
+        path.add(new Tuple('a', this.initialState));
-
+        if(fillToEnd(path, transitions, letters, finished)){
-
+            return false;
-        return continueOnLastTuple(path, transitions, letters);
+        }
+        while(finished.intValue()==0){
+            continueOnLastTuple(path, transitions, letters, finished);
+        }
+        if (finished.intValue() == 1) {
+            return true;
+        } else if (finished.intValue() == 2) {
+            return false;
+        }
+        System.out.println("ERROR-isFinite method isn´t running right!");
+        return true;
+        //return continueOnLastTuple(path, transitions, letters);
     }
 
-    private boolean continueOnLastTuple(List<Tuple> path, List<Transition> transitions, List<Character> letters) {
+    private void continueOnLastTuple(List<Tuple> path, List<Transition> transitions, List<Character> letters, AtomicInteger finished) {
         // path is already filled to end -> check next available state for the transition.
         // case we reached the limit (last state)
         if(path.size()==1){
-            return false;
+            finished.set(1);
+            return;
         }
         String fromState = path.get(path.size()-2).getElement_2();
         Character readSymbol = path.get(path.size()-1).getElement_1();
         Transition currentTransition = new Transition(fromState, readSymbol, path.get(path.size()-1).getElement_2());
-        for(int i=transitions.indexOf(currentTransition);i<transitions.size();i++){
+        for(int i=transitions.indexOf(currentTransition)+1;i<transitions.size();i++){
             if(transitions.get(i).fromState().equals(fromState) && transitions.get(i).readSymbol().equals(readSymbol)){
                 String newState = transitions.get(i).toState();
                 if (stateInPath(path, newState)) {
                     //loop!
                     //loop ends in acceptingstate?
+                    if(stateReachesAcceptingstates(newState)) {
+                        //true:
+                        finished.set(2);
+                        return;
+                    }
                 } else {
                     path.remove(path.size()-1);
                     path. add(new Tuple(readSymbol, newState));
-                    if(fillToEnd(path, transitions, letters)){
+                    if(fillToEnd(path, transitions, letters, finished)){
-                        return true;
+                        return;
                     }
-                    return continueOnLastTuple(path, transitions, letters);
+                    return;// continueOnLastTuple(path, transitions, letters);
                 }
             }
         }
@@ -435,18 +448,28 @@ public class NFAImpl implements NFA {
         for(int i=letters.indexOf(readSymbol)+1;i<letters.size();i++){
             Character newLetter = letters.get(i);
             String newState = checkForNewLetter(path, transitions, letters, newLetter);
+            //more than 1 transition for new letter?
             if(newState!=null){
                 //check given state
                 if(stateInPath(path, newState)){
                     //loop!
                     //loop ends in acceptingstate?
+                    if(stateReachesAcceptingstates(newState)) {
+                        //true:
+                        finished.set(2);
+                        return;
+                    }
+                    //else:
+                    // save !duplicate! and return:
+                    path.add(new Tuple(newLetter, newState));
+                    return;
                 }else {
                     //deletion already in checkForNewLetter.
                     path.add(new Tuple(newLetter, newState));
-                    if(fillToEnd(path, transitions, letters)){
+                    if(fillToEnd(path, transitions, letters, finished)){
-                        return true;
+                        return;
                     }
-                    return continueOnLastTuple(path, transitions, letters);
+                    return;// continueOnLastTuple(path, transitions, letters);
                 }
             }
             //else go to next letter
@@ -455,7 +478,7 @@ public class NFAImpl implements NFA {
         //remove last Tuple
         path.remove(path.size()-1);
         //goto next thingy
-        return continueOnLastTuple(path, transitions, letters);
+        //return;// continueOnLastTuple(path, transitions, letters);
    }
 
     /**
@@ -481,7 +504,7 @@ public class NFAImpl implements NFA {
      * after method need to
      * @return true if a valid loop has been found while filling it up
      */
-    private boolean fillToEnd(List<Tuple> path, List<Transition> transitions, List<Character> letters){
+    private boolean fillToEnd(List<Tuple> path, List<Transition> transitions, List<Character> letters, AtomicInteger finished){
         String fromState = path.get(path.size()-1).getElement_2();
         for(Character letter : letters) {
             for (Transition transition : transitions) {
@@ -490,9 +513,15 @@ public class NFAImpl implements NFA {
                     if(stateInPath(path, transition.toState())) {
                         //loop!
                         //loop reaches a acceptingstate? then return true, else delete some shit
+                        if(stateReachesAcceptingstates(transition.toState())) {
+                            //true:
+                            finished.set(2);
+                            return true;
+                        }
+                        //else do nothing and take next transition if possible
                     } else {
                         path.add(new Tuple(letter, transition.toState()));
-                        return fillToEnd(path, transitions, letters);
+                        return fillToEnd(path, transitions, letters, finished);
                     }
                 }
             }
@@ -510,6 +539,35 @@ public class NFAImpl implements NFA {
         }
         return false;
     }
+    private boolean stateReachesAcceptingstates(String state){
+        if(this.acceptingStates.contains(state)){
+            return true;
+        }
+        Set<String> currentStates = new HashSet<>();
+        Set<String> newStates = new HashSet<>();
+        currentStates.add(state);
+        boolean containsNewStates;
+        do{
+            containsNewStates = false;
+            for(String currentstate : currentStates){
+                for(Transition transition : this.transitions){
+                    if(transition.fromState().equals(currentstate)){
+                        newStates.add(transition.toState());
+                    }
+                }
+            }
+            for(String newState : newStates){
+                if(this.acceptingStates.contains(newState)){
+                    return true;
+                }
+                if(!currentStates.contains(newState)){
+                    containsNewStates=true;
+                    currentStates.add(newState);
+                }
+            }
+        }while(containsNewStates);
+        return false;
+    }
 
     // #TODO
     @Override

src/main/java/ab1/impl/GRUPPE/Tuple.java

@@ -21,20 +21,10 @@ public class Tuple {
 
     private String element_2;
 
-    public boolean isEnd() {
-        return isEnd;
-    }
 
-    private boolean isEnd;
+
     public Tuple(Character firstElement, String secondElement){
         this.element_1=firstElement;
         this.element_2=secondElement;
-        this.isEnd = false;
     }
-    public Tuple(Character firstElement, String secondElement, boolean isend){
-        this.element_1=firstElement;
-        this.element_2=secondElement;
-        this.isEnd = isend;
-    }
-
 }