From 67393f42f41ab92219deb549f711121c4dab845b Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <vn.mcsinyx@gmail.com>
Date: Sun, 15 Dec 2019 10:34:58 +0700
Subject: [usth/ICT2.2] Object Oriented Programming

---
 .../src/main/java/com/mycompany/app/App.java       |  9 ++++++++
 .../src/main/java/com/mycompany/app/Beers.java     | 17 +++++++++++++++
 .../main/java/com/mycompany/app/IsLeapYear.java    | 14 +++++++++++++
 .../src/main/java/com/mycompany/app/Linear.java    | 12 +++++++++++
 .../src/main/java/com/mycompany/app/MeanSTD.java   | 17 +++++++++++++++
 .../src/main/java/com/mycompany/app/Quadratic.java | 24 ++++++++++++++++++++++
 .../src/main/java/com/mycompany/app/RandRange.java | 13 ++++++++++++
 .../src/main/java/com/mycompany/app/TenHellos.java | 10 +++++++++
 .../src/main/java/com/mycompany/app/UseThree.java  | 11 ++++++++++
 9 files changed, 127 insertions(+)
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java
 create mode 100644 usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java

(limited to 'usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany')

diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java
new file mode 100644
index 0000000..0f661cb
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java
@@ -0,0 +1,9 @@
+package com.mycompany.app;
+
+public class App
+{
+  public static void main(String... args)
+  {
+    System.out.println("Hello World!");
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java
new file mode 100644
index 0000000..b74a93b
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java
@@ -0,0 +1,17 @@
+package com.mycompany.app;
+
+// Exercise 4
+public class Beers
+{
+  public static void main(String... args)
+  {
+    for (int i = 9; i > 1; --i)
+      System.out.printf(
+        "%d bottles of beer we are going to drink, %d bottles of beer.\n"
+        + "Now try to drink one, drink one,\n", i, i);
+    System.out.print(
+      "1 bottle of beer we are going to drink, 1 bottle of beer.\n"
+      + "Now try to drink one, drink one,\n"
+      + "Oh no, no bottles of beer to drink now.\n");
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java
new file mode 100644
index 0000000..f21b4b3
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java
@@ -0,0 +1,14 @@
+package com.mycompany.app;
+
+// Exercise 7
+public class IsLeapYear
+{
+  public static void main(String... args)
+  {
+    int n = Integer.parseInt(args[0]);
+    if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0)
+      System.out.printf("%d is a leap year\n", n);
+    else
+      System.out.printf("%d is not a leap year\n", n);
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java
new file mode 100644
index 0000000..e7a8413
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java
@@ -0,0 +1,12 @@
+package com.mycompany.app;
+
+// Exercise 5
+public class Linear
+{
+  public static void main(String... args)
+  {
+    double a = Double.parseDouble(args[0]);
+    double b = Double.parseDouble(args[1]);
+    System.out.println(-b / a);
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java
new file mode 100644
index 0000000..eb47914
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java
@@ -0,0 +1,17 @@
+package com.mycompany.app;
+
+import java.util.Arrays;
+
+// Exercise 8
+public class MeanSTD
+{
+  public static void main(String... args)
+  {
+    double n = args.length;
+    double m = Arrays.stream(args).mapToDouble(Double::parseDouble).sum() / n;
+    double s = Math.sqrt(
+      Arrays.stream(args)
+      .mapToDouble(x -> Math.pow(Double.parseDouble(x) - m, 2)).sum() / n);
+    System.out.printf("Mean: %f\nStandard deviation: %f\n", m, s);
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java
new file mode 100644
index 0000000..84d3ecd
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java
@@ -0,0 +1,24 @@
+package com.mycompany.app;
+
+// Exercise 6
+public class Quadratic
+{
+  public static void main(String... args)
+  {
+    double a = Double.parseDouble(args[0]);
+    double b = Double.parseDouble(args[1]);
+    double c = Double.parseDouble(args[2]);
+    // assume ax^2 + bx + c = 0 is a valid quadratic equation
+    double d = b*b - a*c*4;
+    if (d < 0)
+      {
+        System.out.printf("%f + %fj\n", -b/a/2, Math.sqrt(-d)/a/2);
+        System.out.printf("%f + %fj\n", -b/a/2, -Math.sqrt(-d)/a/2);
+      }
+    else
+      {
+        System.out.println(-b/a/2 + Math.sqrt(d)/a/2);
+        System.out.println(-b/a/2 - Math.sqrt(d)/a/2);
+      }
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java
new file mode 100644
index 0000000..f5c5ffd
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java
@@ -0,0 +1,13 @@
+package com.mycompany.app;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+// Exercise 3
+class RandRange
+{
+  public static void main(String... args)
+  {
+    System.out.println(
+      ThreadLocalRandom.current().nextInt(0, Integer.parseInt(args[0])));
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java
new file mode 100644
index 0000000..a517d39
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java
@@ -0,0 +1,10 @@
+package com.mycompany.app;
+
+public class TenHellos
+{
+  public static void main(String... args)
+  {
+    for (int i = 0; i < 10; ++i)
+      System.out.println("Hello, World!");
+  }
+}
diff --git a/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java
new file mode 100644
index 0000000..a139fc8
--- /dev/null
+++ b/usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java
@@ -0,0 +1,11 @@
+package com.mycompany.app;
+
+// Exercise 2
+class UseThree
+{
+  public static void main(String... args)
+  {
+    System.out.printf("Hi %s, %s and %s.  How are you?\n",
+                      args[2], args[1], args[0]);
+  }
+}
-- 
cgit 1.4.1