update,

_resources/it114105/itp4510/extra/SpecialLab/Main.java

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+interface Payable {
+    public double getPayAmt();
+}
+
+class Invoice implements Payable{
+    private String invid;
+    public double getPayAmt(){
+        return 0.0;
+    }
+}
+
+class Employee extends Person implements Payable {
+    private String empid;
+    public Employee(String empid){
+        this.empid = empid;
+    }
+    public double getPayAmt(){
+        return 0.0;
+    }
+}
+
+abstract class Person {
+    private String name;
+    public String getName(){
+        return name;
+    }
+    public void setName(String name){
+        this.name = name;
+    }
+}
+
+class Customer extends Person {
+    private String custid;
+    public Address address;
+
+    public Customer(){
+        this.address = new Address();
+    }
+}
+
+class Address {
+    private String room;
+    private String street;
+    public String getAddress(){
+        return "";
+    }
+}

_resources/it114105/itp4510/extra/SpecialLab/README.md.original

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+# Special Lab
+Question: create java code (in one file) for the below class diagram
+
+<img src="./class_diagram.png"/>
+* There are some mistake, you need to fix it.