add solutions for hw6:Base

java/wspp/IntList.java

@@ -0,0 +1,28 @@
+package wspp;
+
+public class IntList {
+    private int[] array;
+    private int size;
+
+    public IntList() {
+        array = new int[10];
+        size = 0;
+    }
+
+    public void add(int value) {
+        if (size >= array.length) {
+            int[] newArray = new int[array.length * 2];
+            System.arraycopy(array, 0, newArray, 0, size);
+            array = newArray;
+        }
+        array[size++] = value;
+    }
+
+    public int get(int index) {
+        return array[index];
+    }
+
+    public int size() {
+        return size;
+    }
+}