added files

Author: AnuragAnalog

Interface.java

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+import java.util.*;
+
+// Understanding the interface concept.
+// An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.
+// Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types. Method bodies exist only for default methods and static methods.
+// Writing an interface is similar to writing a class. But a class describes the attributes and behaviors of an object. And an interface contains behaviors that a class implements.
+// Unless the class that implements the interface is abstract, all the methods of the interface need to be defined in the class.
+
+interface Person {
+    void displayDetails();
+    boolean works();
+}
+
+class Student implements Person {
+    String name;
+    int age;
+    String course;
+
+    Student(String name, int age, String course) {
+        this.name = name;
+        this.age = age;
+        this.course = course;
+    }
+
+    public void displayDetails() {
+        System.out.println("Name: "+name+" Age: "+age+" Course: "+course);
+    }
+
+    public boolean works() {
+        return false;
+    }
+}
+
+public class Interface {
+    public static void main(String[] args) {
+        Student student = new Student("John", 20, "Computer Science");
+        student.displayDetails();
+        System.out.println("Does student work? "+student.works());
+    }
+}