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public class MathGame {
public static Map<Integer, String> data = new HashMap<Integer, String>();
public static Map<String, Integer> result = new HashMap<String, Integer>();
String problem;
Random random = new Random();
public void NewProblem() {
String sign = null;
for (int i = 1; i < 5; i++) {
switch (GenNumber(3)) {
case 1:
sign = Sign.MINUS.get();
break;
case 2:
sign = Sign.PLUS.get();
break;
case 3:
sign = Sign.TIMES.get();
break;
default:
sign = Sign.PLUS.get();
break;
}
problem = GenNumber(9) + " " + sign + " " + GenNumber(9);
result.put(problem + " = ???", Decide(Integer.parseInt(
problem.split(" ")[0]), problem.split(" ")[1], Integer
.parseInt(problem.split(" ")[2])));
data.put(i, problem);
}
}
private int GenNumber(int s) {
return random.nextInt(s) + 1;
}
private int Decide(int a, String sign, int b) {
switch (sign) {
case "+":
return a + b;
case "-":
return a - b;
case "*":
return a * b;
}
return 0;
}
public enum Sign {
PLUS("+"),
MINUS("-"),
TIMES("*");
private final String sign;
Sign(String sign) {
this.sign = sign;
}
public String get() {
return sign;
}
}
}