update,

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

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+# Extra Lab - Algorithm Complexity
+
+### Q1
+```
+for (int i = 0; i < n; i++) {
+  for (int j = 0; j < n / 2; j++) {
+    for (int k = 0; k < n / 1000; k++) {
+      //something to run
+    }
+  }
+}
+```
+### Q2
+```
+for (int x = n; x > 10; x /= 2) {
+  //something to run
+}
+```
+
+### Q3
+```
+int g = 1;
+while (g < n) {
+  for (int v = 1; v < n - 9; v++) {
+    //something to run
+  }
+  g *= 3;
+}
+```
+
+### Q4
+```
+int i = 1;
+while (i < n) {
+  i *= 2;
+  method1(n);
+}
+
+public static void method1(int n) {
+  for (int i = 0; i < n / 4; i++) {
+    //something to run
+  }
+}
+```
+
+### Q5
+```
+public static void method2(int n) {
+  //something to run
+  if (n > 10)
+    method2(n / 5);
+}
+```
+
+### Q6
+```
+public static int method3(int n) {
+  //something to run
+  if (n > 10) {
+    return (method3(n - 6));
+  } else
+    return 1;
+  }
+```
+
+### Q7
+```
+public static int method4(int n) {
+  //something to run
+  if (n > 1) {
+    return (method4(n - 1) + method4(n - 1));
+  } else
+    return 1;
+}
+```
+
+## Answer
+```
+q1 O(n^3)
+
+q2 O(log n)
+
+q3 O(n log n)
+
+q4 O(n log n)
+
+q5 O(log n)
+
+q6 O(n)
+
+q7 O(2^n)
+```

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

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+### Extra Lab
+
+<ol>
+<li><a href="./SpecialLab/">Special Lab : create java code (in one file) for the  class diagram</a>
+</li>
+<li><a hre="./AlgoComplexity/">Algorithm/ Methods Complexities</a>
+</ol>

_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.