update,

_resources/it114105/itp4510/Lab01/Lab1.3/PartTimeStaff.java

@@ -0,0 +1,25 @@
+public class PartTimeStaff extends Staff implements Salary {
+    private int workingHour;
+
+    public PartTimeStaff(String name, int id, char grade, int workingHour) {
+        super(name, id, grade);
+        this.workingHour = workingHour;
+    }
+
+    public void display() {
+        System.out.println("Name: " + name + "; ID: " + id + "; Grade: " + grade + "; Working Hour: " + workingHour + "; Salary: " + computeSalary());
+    }
+
+    public int computeSalary() {
+        switch (grade) {
+            case 'A':
+                return SALARY_A;
+            case 'B':
+                return SALARY_B;
+            case 'C':
+                return SALARY_C;
+            default:
+                return SALARY_OTHER;
+        }
+    }
+}