class SubClass1 extends ParentClass { }

Week 5: Class hierarchies/02A Inheritance in Java

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+In Java, each class can DIRECTLY INHERIT UP TO 1 CLASS. 
+In fact, in Java, every class inherits (unless otherwise specified) the PARENT CLASS 'Object'. 
+Thus, all Java classes are DIRECT OR INDIRECT heirs of the class 'Object'.
+
+Inheritance is indicated by the keyword 'extends'. 
+In fact, the English version is perhaps clearer in meaning than inheritance: 
+the INHERITING/CHILD class 'extends' the functionality of the PARENT class, 
+since new properties can be added to the child class in addition to those of the parent class.
+
+
+
+As an example, let us first consider the class 'Person'. 
+The class constructor is currently empty, we will return to this later:
+class Person {
+    private String name;
+    private String email;
+
+    // CONSTRUCTOR - EMPTY
+    public Person() {}
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }  
+}
+ 
+
+Now you can define the class Student, which inherits the Person class. 
+So the Student class has all the features of the Person class (but no new implementation of its own yet).
+class Student extends Person { }
+ 
+
+Similarly, a class Teacher can be defined, which also inherits the Person class. 
+The teacher now also has all the attributes of a person:
+class Teacher extends Person { }
+
+
+