abstract keyword with class

keywords in java/abstractclassdemo.java

@@ -0,0 +1,22 @@
+package tutorial;
+abstract class first1
+{
+	public abstract void eat();
+}
+class second extends first1
+{
+	public void eat()
+	{
+		System.out.println("in class second");
+	}
+}
+
+public class abstractclassdemo {
+
+	public static void main(String[] args) {
+		first1 a=new second();
+		a.eat();
+
+	}
+
+}