diff --git a/Chapter11/Creating_a_Thread.java b/Chapter11/Creating_a_Thread.java
new file mode 100644
index 0000000..b3c357b
--- /dev/null
+++ b/Chapter11/Creating_a_Thread.java
@@ -0,0 +1,39 @@
+// Create a thread by implementing Runnable.
+class MyThread2023 implements Runnable{
+	// Objects of MyThread can be run in their own threads because MyThread implements Runnable.
+	
+	String thrdName;
+	
+	public MyThread2023(String name) {
+		thrdName = name;
+	}
+
+	// Entry point of thread.
+	public void run() {        // Threads start executing here.
+		
+		System.out.println(thrdName + " starting.");
+		
+		try {
+			for (int count = 0; count < 10; count++) {
+				
+				Thread.sleep(400);
+				
+				System.out.println("In " + thrdName + ", count is " + count);
+			}
+		} catch (InterruptedException exc) {
+			System.out.println(thrdName + " interrupted.");
+		}
+		
+	}
+	
+}
+
+
+public class Creating_a_Thread {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+	}
+
+}
diff --git a/Chapter8/Interface/Implementing_Interfaces_implement_clause.java b/Chapter8/Interface/Implementing_Interfaces_implement_clause.java
new file mode 100644
index 0000000..ec8178e
--- /dev/null
+++ b/Chapter8/Interface/Implementing_Interfaces_implement_clause.java
@@ -0,0 +1,59 @@
+package Interface;
+
+// An interface specifies what to do, not how to do.
+interface management{
+	
+	void parenting();
+	void baby_talks();
+	
+	
+}
+
+class parents {
+	
+	String fatherString;
+	String motherString;
+	
+}
+
+// The general form of a class that includes the implements clause looks like this:
+class kids extends parents implements management{
+
+	@Override
+	public void parenting() {
+		// TODO Auto-generated method stub
+		System.out.println(fatherString + "'s fatherhood");
+	}
+
+	@Override
+	public void baby_talks() {
+		// TODO Auto-generated method stub
+		System.out.println( motherString + "'s motherese");
+	}
+	
+}
+
+
+public class Implementing_Interfaces_implement_clause {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		kids janeKids = new kids();
+		kids peterKids = new kids();
+		
+		janeKids.fatherString = "Jansen";
+		janeKids.motherString = "Sharon";
+		janeKids.baby_talks();
+		janeKids.parenting();
+		
+		
+		peterKids.fatherString = "Bill";
+		peterKids.motherString = "Laura";
+		peterKids.baby_talks();
+		peterKids.parenting();
+		
+
+	}
+
+}