hilfe

LinkedList.java

@@ -1,22 +1,22 @@
 
-public class LinkedList
+public class LinkedList<T>
 {
-   private Node start;
+   private Node<T> start;
    public LinkedList(){
    }
-   public LinkedList(int[] arr){
+   public LinkedList(T[] arr){
        for (int i = 0; i < arr.length; i++){
            this.append(arr[i]);
         }
    }
-   public LinkedList(int st){
+   public LinkedList(T st){
        start = new Node(st);
    }
    
-   public void append(int zahl){
+   public void append(T zahl){
         //anlegen eines neuen Nodes
-        Node neu = new Node(zahl);       
-        Node current = this.start;
+        Node<T> neu = new Node(zahl);       
+        Node<T> current = this.start;
         if (this.start == null){
             this.start = neu;
         }
@@ -34,7 +34,7 @@ public class LinkedList
    public int length(){
        Node current = this.start;
        int count= 0;
-       while(current.next != null){
+       while(current != null){
            current = current.next;
            count++;
        }
@@ -42,20 +42,20 @@ public class LinkedList
        return count;
    }
    
-   public int erste(){
-       if (start == null) return 0;
-       int i = this.start.wert;
+   public T erste(){
+       if (start == null) return null;
+       T i = this.start.wert;
        this.start = start.next;
        return i;
    }
    
-   public int getNteZahl(int n){
-       Node current = this.start;
+   public T getNtenWert(int n){
+       Node<T> current = this.start;
        for ( int i = 0; i < n ; i++ ){
-           if (current == null)return 0;
+           if (current == null)return null;
            current = current.next;
        }
-       if (current == null ) return 0;
+       if (current == null ) return null;
        return current.wert;
        
    }
@@ -64,7 +64,7 @@ public class LinkedList
        String result = "";
        
        for (int i = 0; i < this.length(); i++){
-           result += this.getNteZahl(i) + ",";
+           result += this.getNtenWert(i) + ",";
        }
        return result;
    }

Node.java

@@ -1,12 +1,12 @@
 
-public class Node
+public class Node<T>
 {
-    public int wert;
+    public T wert;
     public Node next;
-    public Node(int w){
+    public Node(T w){
         this.wert = w;
     }
-    public void setWert(int w){
+    public void setWert(T w){
         this.wert = w;
     }
     

test.java

@@ -7,10 +7,22 @@ public class test
         for (int i = 0; i < arr.length; i++){
             arr[i] = r.nextInt();
         }
-        LinkedList test = new LinkedList(arr);
+        LinkedList<Integer> test = new LinkedList(arr);
         
         System.out.println(test);
         System.out.println(test.erste());
         System.out.println(test);
+        System.out.println(test.getNtenWert(2));
+        System.out.println(test.getNtenWert(23));
+        
+        LinkedList<String> test2 = new LinkedList<String>([{"Hallo", "Welt"}]);
+        
+        
+    }
+    public static void test2(){
+        Node<String> n = new Node<String>("Hallo");
+        Node<Integer> i = new Node<Integer>(5);
+        
+        
     }
 }