Display yield state

cm/Main.java

@@ -1,8 +1,15 @@
 public class Main {
 	public static void main (String argv[]) {
 		Thread tA, tB;
-		tA = new DispTask(false, "tA");
-		tB = new DispTask(false, "tB");
+		boolean doYield = false;
+
+		if (doYield)
+			System.out.println("Do yield");
+		else
+			System.out.println("NOT do yield");
+
+		tA = new DispTask(doYield, "tA");
+		tB = new DispTask(doYield, "tB");
 
 		tA.start();
 		tB.start();