Random.java

public class Random {

	public static void randomlyThrow() throws Exception {
		if (Math.random() < 0.25) {
			throw new Exception("Random!");
		}
	}

	public static void main(String[] args) {
		int failures = 0;
		for (int i = 0; i < 1000; i++) {
			int throwCount = 0;
			for (int j = 0; j < 11; j++) {
				try {
					randomlyThrow();
				} catch (Exception e) {
					throwCount++;
				}
			}
			if (throwCount < 2) {
				failures++;
			}
		}
		System.out.println("Failed " + failures + " times");
	}

}