[staykovmarin]

Code:

		int f = (String) phoneArray[2];
		if (0 <= f <= 100) {
			String a = null;
			if (0 <= f < 60) {
				a = "E";
				} else if (60 <= f < 70) {
					a = "D";
				} else if (70 <= f < 80) {
					a = "C";
				} else if (80 <= f < 90) {
					a = "B";
				} else if (90 <= f <= 100) {
					a = "A";
				}
			} else if (((int) f > 100) + ((int) f < 0)) {
		SimpleOutput.showError("Score is not an integer");
		String g = new String();
		g = phoneArray[2];

Your problem is here: int f = (String) phoneArray[2];

Try compiling it and seeing the error for yourself. I surely hope none actually takes this post seriously and does your homework for you.