Directory rename

4 files changed, 49 insertions, 0 deletions

diff --git a/oop/03-interfaces/.gitignore b/oop/03-interfaces/.gitignore
new file mode 100644
index 0000000..6b468b6
--- /dev/null
+++ b/oop/03-interfaces/.gitignore
@@ -0,0 +1 @@
+*.class
diff --git a/oop/03-interfaces/BasicCalculator.java b/oop/03-interfaces/BasicCalculator.java
new file mode 100644
index 0000000..f087d81
--- /dev/null
+++ b/oop/03-interfaces/BasicCalculator.java
@@ -0,0 +1,15 @@
+//public class BasicCalculator implements Calculator, ScientificCalculator {
+public class BasicCalculator implements Calculator {
+
+	public int add(int a, int b) {
+		return a + b;
+	}
+
+	public int subtract(int a, int b) {
+		return a - b;
+	}
+
+	public double divide(double a, double b) {
+		return a / b;
+	}
+}
diff --git a/oop/03-interfaces/Calculator.java b/oop/03-interfaces/Calculator.java
new file mode 100644
index 0000000..aa716b0
--- /dev/null
+++ b/oop/03-interfaces/Calculator.java
@@ -0,0 +1,24 @@
+//abstract interface Calculator {
+interface Calculator {
+	public final static double PI = 3.14;
+
+	// double PI = 3.14;
+	// public static double PI = 3.14;
+	// public final double PI = 3.14;
+	// final double PI = 3.14;
+	// static double PI = 3.14;
+
+	public int add(int a, int b);
+	// int add(int a, int b);
+	// abstract int add(int a, int b);
+	// public abstract int add(int a, int b);
+
+	// static int add(int a, int b); // Not allowed
+	// int add(int a, int b); // Allowed
+	
+//	public int subtract(int a, int b);
+//	int subtract(int a, int b);
+	abstract int subtract(int a, int b);
+
+	public double divide(double a, double b);
+}
diff --git a/oop/03-interfaces/CalculatorTest.java b/oop/03-interfaces/CalculatorTest.java
new file mode 100644
index 0000000..e2340dd
--- /dev/null
+++ b/oop/03-interfaces/CalculatorTest.java
@@ -0,0 +1,9 @@
+public class CalculatorTest {
+
+	public static void main(String[] args) {
+		Calculator cal = new BasicCalculator();
+
+		System.out.println(cal.add(1, 3));
+		//....
+	}
+}