14 Asar

LinkedList.java

@@ -1,12 +1,12 @@
 
-public class LinkedList
+public class LinkedList<T>
 {
-  private Node start;
+  private Node<T> start;
   public LinkedList(){
       
   }
   
-  public void einfuegen(int zahl){
+  public void einfuegen(T zahl){
       Node neu = new Node();
          neu.wert = zahl;
          if (this.start == null) {
@@ -41,14 +41,26 @@ public class LinkedList
       return result;
   }
   
-  public int erste(){
-      int tmp = this.start.wert;
+  public T erste(){
+      if ( this.start == null){
+          return null;
+      }
+      
+      T tmp = this.start.wert;
+      
       this.start = this.start.next;
       return tmp;
   }
   
-  public int getNteZahl(int n){
-      return 0;
+  public T getNteZahl(int n){
+      Node<T> current = this.start;
+      
+      for (int i = 0; i < n; i++){
+          if (current == null) return null;
+          current = current.next;
+      }
+      if( current == null) return null;
+      return current.wert;
   }
   
 }

Node.java

@@ -1,10 +1,10 @@
 
-public class Node
+public class Node<T>
 {
-  public int wert;
+  public T wert;
   public Node next;
   
-  public void setWert(int w){
+  public void setWert(T w){
       this.wert = w;
   }
   public void setNext(Node n){

Test3.java

@@ -16,4 +16,13 @@ public class Test3
         System.out.println(1);
         
     }
+    public static void test2(){
+        Node<String> n = new Node<String>();
+        
+        n.wert = "Hallo";
+        
+        Node<Integer> i = new Node<Integer>();
+        
+        i.wert = 5;
+    }
 }