refactor

school/Teacher.java

@@ -0,0 +1,23 @@
+package school;
+
+public class Teacher extends Person {
+    private String teacherID;
+
+    public Teacher(String name, int age, String teacherID) {
+        super(name, age);
+        this.teacherID = teacherID;
+    }
+
+    public void speak() {
+        System.out.println("I am a teacher, my name is " + getName() + ", and I am " + getAge()
+                + " years old. My teacher ID is " + teacherID + ".");
+    }
+
+    public String getTeacherID() {
+        return teacherID;
+    }
+
+    public void setTeacherID(String teacherID) {
+        this.teacherID = teacherID;
+    }
+}