Abstract

Author: KNandhakumar

src/NandhuDSA/oops/Abstract/Abstract

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+• An abstract class in Java cannot be instantiated on its own; it is designed to be subclassed.
+
+• Contains both abstract methods (without a body) and concrete methods (with a body).
+
+• Provides a common base for subclasses, allowing them to share code.
+
+• Enables subclasses to provide specific implementations for the abstract methods.

src/NandhuDSA/oops/Abstract/bike.java

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+package NandhuDSA.oops.Abstract;
+
+public class bike extends vehicle{
+    void speed(){
+        System.out.println("100km/h");
+    }
+}

src/NandhuDSA/oops/Abstract/car.java

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+package NandhuDSA.oops.Abstract;
+
+public class car extends vehicle{
+    void speed(){
+        System.out.println("190km/h");
+    }
+}

src/NandhuDSA/oops/Abstract/main.java

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+package NandhuDSA.oops.Abstract;
+
+public class main {
+    public static void main(String[] args) {
+        bike b1 = new bike();
+        b1.speed();
+    }
+}

src/NandhuDSA/oops/Abstract/vehicle.java

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+package NandhuDSA.oops.Abstract;
+
+public abstract class vehicle { // abstract method only in abstract class
+    abstract void speed(); // this abstract class usage is all the child class override this abstract class
+}
+