Add 3 1b) (Int Stack)

src/part3/aufg1/Anwendung.java

@@ -20,19 +20,39 @@ package part3.aufg1;
  */
 
 public class Anwendung {
-    public static void main(String[] args){
+    public void myIntStackDemo(){
+
         IntStack myIntStack = new IntStack();
-        myIntStack.push(7);myIntStack.print();
+        myIntStack.p_push(7);
-        myIntStack.push(3);myIntStack.print();
+        myIntStack.p_push(3);
-        myIntStack.push(8);myIntStack.print();
+        myIntStack.p_push(8);
-        myIntStack.push(2);myIntStack.print();
+        myIntStack.p_push(2);
 
-        myIntStack.pop();myIntStack.print();
+        myIntStack.p_pop();
-        myIntStack.pop();myIntStack.print();
+        myIntStack.p_pop();
 
-        myIntStack.push(7);myIntStack.print();
+        myIntStack.p_push(7);
 
-        myIntStack.pop();myIntStack.print();
+        myIntStack.p_pop();
-        myIntStack.pop();myIntStack.print();
+        myIntStack.p_pop();
+        myIntStack.p_pop();
+    }
+    public void myGenericStackDemo(){
+        GenericStack myStack = new GenericStack();
+
+        myStack.p_push(1);
+        myStack.p_push('B');
+        myStack.p_push(true);
+
+        myStack.p_pop();
+        myStack.p_push("\"Ich Liebe Generische Typen\"");
+    }
+    public static void main(String[] args){
+        Anwendung demo = new Anwendung();
+        demo.myIntStackDemo();
+
+        System.out.println("=====/////======");
+
+        demo.myGenericStackDemo();
         }
 }

src/part3/aufg1/GenericStack.java

@@ -0,0 +1,51 @@
+package part3.aufg1;
+
+import java.util.Arrays;
+
+public class GenericStack<T> {
+    Object[] myArray;
+    private int MAX_SIZE;
+    private int firstFreeIndex;
+
+    public GenericStack(){
+        this.MAX_SIZE = 100;
+        this.firstFreeIndex = 0;
+        this.myArray = new Object[MAX_SIZE];
+    }
+
+    public void push(T t){
+        this.myArray[this.firstFreeIndex] = t;
+        this.firstFreeIndex++;
+    }
+
+    public void p_push(T t){
+        this.push(t);
+        this.print();
+    }
+
+    public T pop(){
+        return (T) this.myArray[--this.firstFreeIndex];
+    }
+
+    public T p_pop(){
+        T temp = this.pop();
+        this.print();
+        return temp;
+    }
+
+    public Object[] toArray(){
+        if (this.firstFreeIndex<1){
+            return new Object[0];
+        }
+        Object[] retArray = new Object[this.firstFreeIndex];
+        for (int i=0; i<firstFreeIndex; i++){
+            retArray[i] = this.myArray[i];
+        }
+        return retArray;
+    }
+
+    public void print(){
+        System.out.println(Arrays.toString(this.toArray()));
+    }
+}
+

src/part3/aufg1/IntStack.java

@@ -18,13 +18,24 @@ public class IntStack {
         this.firstFreeIndex++;
     }
 
+    public void p_push(int value){
+        this.push(value);
+        this.print();
+    }
+
     public int pop(){
         return this.myArray[--this.firstFreeIndex];
     }
 
+    public int p_pop(){
+        int temp = this.pop();
+        this.print();
+        return temp;
+    }
+
     public int[] toArray(){
         if (firstFreeIndex<1){
-            return null;
+            return new int[0];
         }
         int[] retArray = new int[firstFreeIndex];
         for (int i=0; i<firstFreeIndex; i++){