Committing two additional files

Rocky Bhai · Rocky Bhai · commit ef9713ae26bf · 2020-02-01T06:25:31.000Z
diff --git a/javabasic/sample/GenericsWildcard.java b/javabasic/sample/GenericsWildcard.java
@@ -0,0 +1,45 @@
+package sample;
+
+import java.util.ArrayList;
+
+// Using generics with wildcard
+
+class Machine1 {
+	@Override
+	public String toString() {
+		return "This is a Machine.";
+	}
+
+}
+
+class Camera extends Machine1 {
+	@Override
+	public String toString() {
+		return "This is a Camera.";
+	}
+}
+
+public class GenericsWildcard {
+
+	public static void showList(ArrayList<?> list) {
+		for (Object value : list) {
+			System.out.println(value);
+		}
+	}
+
+	public static void main(String[] args) {
+		ArrayList<Machine1> list1 = new ArrayList<Machine1>();
+
+		list1.add(new Machine1());
+		list1.add(new Machine1());
+
+		ArrayList<Camera> list2 = new ArrayList<Camera>();
+
+		list2.add(new Camera());
+		list2.add(new Camera());
+		
+		showList(list1);
+		showList(list2);
+	}
+
+}
diff --git a/javabasic/sample/UsingGenerics.java b/javabasic/sample/UsingGenerics.java
@@ -0,0 +1,47 @@
+package sample;
+
+import java.util.ArrayList;
+
+public class UsingGenerics {
+	
+	public static void showStringList(ArrayList<String> strings)
+	{
+		for (int i = 0; i < strings.size(); i++) {
+			System.out.println("Animal name is: " + strings.get(i));
+		}
+	}
+	
+	public static void showDoubleList(ArrayList<Double> dbValue)
+	{
+		for (int i = 0; i < dbValue.size(); i++) {
+			System.out.println("Double value is: " + dbValue.get(i));
+		}
+	}
+
+	public static void main(String[] args) {
+		ArrayList<String> strings = new ArrayList<String>();
+		
+		strings.add("Cat");
+		strings.add("Dogs");
+		strings.add("Elephants");
+		strings.add("Donkeys");
+
+		showStringList(strings);
+		
+		strings.add(2, "Monkeys");
+		strings.add(4,"Hippos");
+		
+		System.out.println("****************************");
+		showStringList(strings);
+		
+		System.out.println("****************************");
+		ArrayList<Double> dbValue = new ArrayList<Double>();
+		dbValue.add(32.65);
+		dbValue.add(3243.54354);
+		dbValue.add(654.0154);
+		dbValue.add(983940.2132);
+		
+		showDoubleList(dbValue);
+	}
+
+}
