Java Annotations

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  • + 0 comments

    Attention: The test will fail if you change any white-space in the code! Only edit the marked parts, nothing else.

  • + 0 comments

    CORRECT SOLUTION IN JAVA 8:

    import java.lang.annotation.; import java.lang.reflect.; import java.util.*;

    @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @interface FamilyBudget { String userRole() default "GUEST"; int budgetLimit(); }

    class FamilyMember { @FamilyBudget(userRole = "SENIOR", budgetLimit = 100) public void seniorMember(int budget, int moneySpend) { System.out.println("Senior Member"); System.out.println("Spend: " + moneySpend); System.out.println("Budget Left: " + (budget - moneySpend)); }

    @FamilyBudget(userRole = "JUNIOR", budgetLimit = 50)
    public void juniorUser(int budget, int moneySpend) {
        System.out.println("Junior Member");
        System.out.println("Spend: " + moneySpend);
        System.out.println("Budget Left: " + (budget - moneySpend));
    }
    

    }

    public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int testCases = Integer.parseInt(in.nextLine()); while (testCases > 0) { String role = in.next(); int spend = in.nextInt(); try { Class annotatedClass = FamilyMember.class; Method[] methods = annotatedClass.getMethods(); for (Method method : methods) { if (method.isAnnotationPresent(FamilyBudget.class)) { FamilyBudget family = method .getAnnotation(FamilyBudget.class); String userRole = family.userRole(); int budgetLimit = family.budgetLimit(); if (userRole.equals(role)) { if(spend<=budgetLimit){ method.invoke(FamilyMember.class.newInstance(), budgetLimit, spend); }else{ System.out.println("Budget Limit Over"); } } } } } catch (Exception e) { e.printStackTrace(); } testCases--; } } }

  • + 0 comments

    in this task DO NOT TOUCH any other line than marked! DO NOT ADD a single character anywere beside the marked lines!

  • + 2 comments

    Why did they not explicitly state the budget limit for Junior and Senior role? Unnecessarily increasing complexity tbh.

  • + 0 comments

    Java Annotations simplify code by providing metadata for classes, methods, and fields, improving readability and maintainability. Explore more insights at RVA Clean Air.