import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
public static void main(String[] args)
throws NoSuchMethodException,InvocationTargetException, IllegalAccessException {
Calculator calculator = new Calculator();

 Integer returnValue = Action.run(
1,
 Integer.class,
 calculator,
 Calculator.class.getDeclaredMethod(
"plus",
Integer.class,
Integer.class
 ),
5,
 10);
 System.out.println("returnValue : " + returnValue);

 Integer staticReturnValue = Action.run(
1,
 Integer.class,
 null,
 Calculator.class.getDeclaredMethod(
"minus",
 Integer.class,
 Integer.class),
 5,
 10);
 System.out.println("staticReturnValue : " + staticReturnValue);

 }

static class Calculator {
public Integer plus(Integer a, Integer b) {
System.out.println(a + " + " + b + " = " + (a + b));
 return a + b;
 }

public static Integer minus(Integer a, Integer b) {
System.out.println(a + " - " + b + " = " + (a - b));
 return a - b;
 }
}

static class Action {
public static <T> T run(
double percentage,
 Class<T> returnClass,
 Object object,
 Method method,
 Object... args)
throws InvocationTargetException, IllegalAccessException {
double random = Math.random();
 if (random < percentage) {
return (T) method.invoke(object, args);
 }
return null;
 }
}
}


대충 확률로 메서드 실행 시켜주는 건데 


생각해보니까 그냥 메서드마다 확률로 실행시켜주는 걸 넣는 게 나을 듯 싶긴한 데 몰루겠다 ㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇ