update,

it114105/itp4510/Lab01/Lab1.3/Staff.java

@@ -0,0 +1,13 @@
+public abstract class Staff {
+    protected String name;
+    protected int id;
+    protected char grade;
+
+    public Staff(String name, int id, char grade) {
+        this.name = name;
+        this.id = id;
+        this.grade = grade;
+    }
+
+    public abstract void display();
+}