LotteryLabelledContinue.java

package tutorialquestions.question4c70;

import java.util.Random;

class LotteryLabelledContinue {

 private static final int numNumbers = 7;

 private static final int lotteryMax = 49;

 /**
 * This solution illustrates the use of a labelled `continue'. This is
 * not commonly used in Java, and is considered bad practice by some,
 * but here it is!
 */
 public static void main(String[] args) {

 int[] numbers = new int[numNumbers];

 Random generator = new Random();

 int nextNumber = 0;

 chooseNumbers:
 while (nextNumber < numNumbers) {

 int candidateNumber = generator.nextInt(lotteryMax) + 1;

 for (int i = 0; i < nextNumber; i++) {

 if (numbers[i] == candidateNumber) {
 // The number we chose is no good: skip on to next outer loop iteration.
 continue chooseNumbers;
 }
 }

 numbers[nextNumber] = candidateNumber;
 nextNumber++;

 if (nextNumber < numNumbers) {
 System.out.print("Number " + nextNumber);
 } else {
 System.out.print("Bonus ball");
 }
 System.out.println(": " + candidateNumber);

 }

 }

}