LinkedList remove und contain

list/src/main/java/de/vivi/list/LinkedByteList.java

@@ -4,21 +4,19 @@ import java.util.*;
 
 public class LinkedByteList implements ByteList {
 
-    private NodeLinked head;
     private NodeLinked currNode;
     private int size;
-
-    public LinkedByteList() {
-        head = null;
-    }
+    private NodeLinked last;
+    private NodeLinked first;
+    int result;
 
     @Override
     public void add(byte value) {
         NodeLinked newNode = new NodeLinked(value); // erzeuge neues Node
-        if (head == null) {
-            head = newNode;
+        if (first == null) {
+            first = newNode;
         } else {
-            NodeLinked last = head;
+            NodeLinked last = first;
             while (last.next != null) {
                 last = last.next;
             }
@@ -30,33 +28,78 @@ public class LinkedByteList implements ByteList {
     @Override
     public void add(int index, byte value) {
         if (index == size) {
-
+            linkLast(value);
+        } else {
+            linkBefore(value, node(index));
         }
     }
 
+    void linkBefore(byte value, NodeLinked succ) {
+        NodeLinked pred = succ.prev;
+        NodeLinked newNode = new NodeLinked(value, succ);
+        succ.prev = newNode;
+        if (pred == null)
+            first = newNode;
+        else
+            pred.next = newNode;
+        size++;
+    }
+
+    void linkLast(byte value) {
+        NodeLinked l = last;
+        NodeLinked newNode = new NodeLinked(value);
+        last = newNode;
+        size++;
+    }
 
     @Override
     public void remove(int index) {
-       size--;
+        NodeLinked current = first;
+        if (index == 0) {
+            size--;
+            first = current.next;
+        }
+
+        NodeLinked temp = null;
+        for (int i = 1; i <= index; i++) {
+            temp = current;
+            current = current.next;
+        }
+
+        temp.next = current.next;
+        size--;
     }
 
     @Override
     public void set(int index, byte value) {
         NodeLinked x = node(index);
-        x.value = value;
+        x.item = value;
     }
 
     NodeLinked node(int index) {
-        NodeLinked x = head;
+        NodeLinked current = first;
         for (int i = 0; i < index; i++) {
-            x = x.next;
+            current = current.next;
         }
-        return x;
+        return current;
     }
+//    NodeLinked node(int index) {
+//        if (index < (size >> 1)) {
+//            NodeLinked x = first;
+//            for (int i = 0; i < index; i++)
+//                x = x.next;
+//            return x;
+//        } else {
+//            NodeLinked x = last;
+//            for (int i = size - 1; i > index; i--)
+//                x = x.prev;
+//            return x;
+//        }
+//    }
 
     @Override
     public byte get(int index) {
-        return node(index).value;
+        return node(index).item;
     }
 
     @Override
@@ -66,7 +109,17 @@ public class LinkedByteList implements ByteList {
 
     @Override
     public boolean contains(int value) {
-        return false;
+        byte byteValue = (byte) value;
+        boolean isEqual = false;
+        for (int i = 0; i < size; i++) {
+            if (get(i) == byteValue) {
+                isEqual = true;
+                break;
+            } else {
+                isEqual = false;
+            }
+        }
+        return isEqual;
     }
 
     @Override
@@ -76,12 +129,12 @@ public class LinkedByteList implements ByteList {
 
     @Override
     public void clear() {
-        for (NodeLinked x = head; x != null;) {
+        for (NodeLinked x = first; x != null;) {
             NodeLinked next = x.next;
             x.next = null;
             x = next;
         }
-        head = null;
+        first = null;
         size = 0;
     }
 
@@ -90,21 +143,12 @@ public class LinkedByteList implements ByteList {
         return null;
     }
 
-    public Byte[] toArray() {
-        Byte[] result = new Byte[size];
-        int i = 0;
-        for (NodeLinked x = head; x != null; x = x.next) {
-            result[i++] = x.value;
-        }
-        return result;
-    }
-
     @Override
     public String toString() {
         System.out.print("LinkedList: ");
-        currNode = head;
+        currNode = first;
         while (currNode != null) {
-            System.out.print(currNode.value + " ");
+            System.out.print(currNode.item + " ");
             currNode = currNode.next;
         }
         return String.valueOf(currNode).replace("null", "");

list/src/main/java/de/vivi/list/Main.java

@@ -31,8 +31,13 @@ public class Main {
         list.add((byte) 5);
         list.add((byte) -100);
 
+
         System.out.println(list);
 
+//        list.remove(4);
+//        list.contains(5);
+        System.out.println(list.contains(2));
+
 //        list.add(0, (byte) 99);
 //        list.add(3, (byte) 99);
 ////        System.out.println(list);

list/src/main/java/de/vivi/list/NodeLinked.java

@@ -2,11 +2,22 @@ package de.vivi.list;
 
 public class NodeLinked {
 
-    byte value;
+    byte item;
     NodeLinked next;
+    NodeLinked prev;
 
-    public NodeLinked(byte value) {
-        this.value = value;
+    public NodeLinked(NodeLinked prev, byte element, NodeLinked next) {
+        this.item = element;
+        this.next = null;
+        this.prev = null;
+    }
+
+    public NodeLinked(byte element) {
+        this.item = element;
+    }
+
+    public NodeLinked(byte element, NodeLinked next) {
+        this.item = element;
         this.next = null;
     }
 }