Update to java 20 and some refactoring

pom.xml

@@ -54,8 +54,8 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 				<version>3.8.0</version>
 				<configuration>
 					<compilerArgs>--enable-preview</compilerArgs>
-                    <source>19</source>
+                    <source>20</source>
-                    <target>19</target>
+                    <target>20</target>
                 </configuration>
 			</plugin>
 			<plugin>
@@ -112,8 +112,8 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 		</repository>
 	</repositories>
 	<properties>
-		<maven.compiler.source>19</maven.compiler.source>
+		<maven.compiler.source>20</maven.compiler.source>
-		<maven.compiler.target>19</maven.compiler.target>
+		<maven.compiler.target>20</maven.compiler.target>
 		<mainClass>de.dhbwstuttgart.core.ConsoleInterface</mainClass>
 	</properties>
 	<distributionManagement>

resources/insertGenerics/javFiles/TestTPHsAndGenerics2.jav

@@ -10,4 +10,5 @@ class TPHsAndGenerics2 {
     m2(a, b){
         return b;
     }
+
 }

resources/insertGenerics/javFiles/TestVector.jav

@@ -3,7 +3,9 @@ import java.util.Vector;
 public class TestVector {
 
 	m(v, w) {
-		w.addElement(id(v.elementAt(0)));
+	    var a = v.elementAt(0);
+	    var b = id(a);
+		w.addElement(b);
 	}
 	
 	id(x) {

resources/javFiles/Lambda.jav

@@ -10,4 +10,3 @@ public class Lambda {
    return lam1.apply(new Apply());
   }
 }
-

resources/javFiles/OL.jav

@@ -1,4 +1,3 @@
-import java.lang.Integer;
 import java.lang.Double;
 import java.lang.String;
 import java.lang.Long;

src/main/java/de/dhbwstuttgart/target/generate/GenerateGenerics.java

@@ -677,6 +677,7 @@ public abstract class GenerateGenerics {
                     if (!added) break;
                 }
 
+                System.out.println(chain + " " + chain.stream().map(e -> e.resolve().getVariance()).toList());
                 var variance = chain.get(0).resolve().getVariance();
                 if (variance != 1) continue;
                 var index = 0;