PlayWithBetterExceptions.java

package dk.itu.abhn.sandbox;

public class PlayWithBetterExceptions {

	int[] someArray;
	
	public PlayWithBetterExceptions() {
		someArray = new int[]{1, 2, 3, 4, 5}; // array that is 5 elements long!
	}
	
	public static void main(String[] args) {
		PlayWithBetterExceptions t = new PlayWithBetterExceptions();
		
		System.out.println(t.accessElementOutOfBounds(4)); // this is ok! Element 4 exists and = 5.
		System.out.println(t.accessElementOutOfBounds(5)); // wow wow wow! calm down there.. no such element!
		// No worries, we wont crash thanks to our method throwing the exception to a try..catch!
	}
	
	public int accessElementOutOfBounds(int elementNumber) throws ArrayIndexOutOfBoundsException {
		try {
			return someArray[elementNumber];
		} catch (ArrayIndexOutOfBoundsException e) {
			System.out.println("Ok we failed, but at least we didnt crash! WOOP!");
			return -1; // print some stupid number to show that we failed!
		}
	}
}

PlayWithExceptions.java

package dk.itu.abhn.sandbox;

public class PlayWithExceptions {

	int[] someArray;
	
	public PlayWithExceptions() {
		someArray = new int[]{1, 2, 3, 4, 5}; // array that is 5 elements long!
	}
	
	public static void main(String[] args) {
		PlayWithExceptions t = new PlayWithExceptions();
		
		System.out.println(t.accessElementOutOfBounds(4)); // this is ok! Element 4 exists and = 5.
		System.out.println(t.accessElementOutOfBounds(5)); // wow wow wow! calm down there.. no such element!
		// Thereafter the program simply crashes..
	}
	
	public int accessElementOutOfBounds(int elementNumber) {
		return someArray[elementNumber];
	}
}