From fab39307b045215fb465701009bb0d454788a4ca Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Sat, 21 Feb 2026 19:56:23 +0530
Subject: Added simple OOP sample code.

---
 oop/03-static-methods/.gitignore      |  1 +
 oop/03-static-methods/Calculator.java | 29 +++++++++++++++++++++++++++++
 oop/03-static-methods/MyApp.java      | 25 +++++++++++++++++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 oop/03-static-methods/.gitignore
 create mode 100644 oop/03-static-methods/Calculator.java
 create mode 100644 oop/03-static-methods/MyApp.java

(limited to 'oop/03-static-methods')

diff --git a/oop/03-static-methods/.gitignore b/oop/03-static-methods/.gitignore
new file mode 100644
index 0000000..6b468b6
--- /dev/null
+++ b/oop/03-static-methods/.gitignore
@@ -0,0 +1 @@
+*.class
diff --git a/oop/03-static-methods/Calculator.java b/oop/03-static-methods/Calculator.java
new file mode 100644
index 0000000..7ec2851
--- /dev/null
+++ b/oop/03-static-methods/Calculator.java
@@ -0,0 +1,29 @@
+
+public class Calculator {
+	public static int x; // static (class) field
+	public int y; // instance field
+	
+	public static int add(int a, int b) { // static (class) method
+		return a + b;
+	}
+	
+	public static int subtract(int a, int b) {  // static (class) method
+		return a - b;
+	}
+	
+	public static double convertFromC2F(double cTemp) {  // static (class) method
+		return cTemp*180/100 + 32.0;
+	}
+	
+	public void setY(int y) { // instance method
+		this.y = y;
+	}
+	
+	public int getXxY() { // instance method
+		return x * y;
+	}
+	
+//	public static int getXxY2() {
+//		return x * y;
+//	}
+}
diff --git a/oop/03-static-methods/MyApp.java b/oop/03-static-methods/MyApp.java
new file mode 100644
index 0000000..0137433
--- /dev/null
+++ b/oop/03-static-methods/MyApp.java
@@ -0,0 +1,25 @@
+
+public class MyApp {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		System.out.println(Calculator.convertFromC2F(100.0));
+		
+		Calculator.x = 5;
+		
+		Calculator cal1 = new Calculator();
+		cal1.setY(10);
+		System.out.println(cal1.getXxY()); // prints 50
+		
+		Calculator cal2 = new Calculator();
+		cal2.setY(11);
+		
+		Calculator.x = 6;
+		
+		System.out.println(cal1.getXxY()); // 60
+		System.out.println(cal2.getXxY()); // 66
+	}
+
+}
-- 
cgit v1.2.3