lesson #7

Author: biblelamp

BerlinTelran/grp_10-170123-e-be/src/lesson7/Lesson7.java

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+package lesson7;
+
+import java.util.List;
+import java.util.Stack;
+import java.util.Vector;
+
+public class Lesson7 {
+    public static void main(String[] args) {
+        SimpleBox<Integer> box1 = new SimpleBox<>(5);
+        SimpleBox<Integer> box2 = new SimpleBox<>(8);
+        SimpleBox<String> box3 = new SimpleBox<>("Box");
+
+        int sum = box1.getValue() + box2.getValue();
+        System.out.println(sum);
+
+        // talking about homework
+        Integer[] integers = {4, 3, 2, 1, 6, 7};
+        swapElements(2, 4, integers);
+
+        String[] strings = {"qwe", "dfa", "sdf", "fff"};
+        swapElements(1, 3, strings);
+
+        // using RubberArray
+        RubberArray<Integer> ints = new RubberArray<>();
+        ints.add(15);
+        ints.add(9);
+        System.out.println(ints);
+
+        RubberArray<String> strs = new RubberArray<>();
+        strs.add("Hello");
+        strs.add("Java");
+        System.out.println(strs);
+    }
+
+    static <T> void swapElements(int idxSrc, int idxTrg, T[] array) {
+        System.out.println(array[idxSrc]);
+        System.out.println(array[idxTrg]);
+    }
+
+    static <T> List<T> toList(T[] array) {
+        return null;
+    }
+}

BerlinTelran/grp_10-170123-e-be/src/lesson7/RubberArray.java

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+package lesson7;
+
+public class RubberArray<E> {
+    private Object[] array;
+
+    public RubberArray() {
+        array = new Object[0];
+    }
+
+    public void add(E value) {
+        Object[] newArray = new Object[array.length + 1];
+        System.arraycopy(array, 0, newArray, 0, array.length);
+        newArray[array.length] = value;
+        array = newArray;
+    }
+
+    public E get(int index) {
+        return (E) array[index];
+    }
+
+    public void remove(int index) {
+        Object[] newArray = new Object[array.length - 1];
+        System.arraycopy(array, 0, newArray, 0, index);
+        System.arraycopy(array, index + 1, newArray, index, array.length - index - 1);
+        array = newArray;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer sb = new StringBuffer("[");
+        for (int i = 0; i < array.length; i++) {
+            sb.append(array[i]);
+            if (i < array.length - 1) {
+                sb.append(", ");
+            }
+        }
+        return sb.append("]").toString();
+    }
+}

BerlinTelran/grp_10-170123-e-be/src/lesson7/SimpleBox.java

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+package lesson7;
+
+public class SimpleBox<V> {
+    private V value;
+
+    public SimpleBox(V value) {
+        this.value = value;
+    }
+
+    public V getValue() {
+        return value;
+    }
+}