❌ A. Max Integer: 4 Max Double: 3.3 ❌ B. Max Integer: 2 Max Double: 2.2 ❌ C. Max Integer: 1 Max Double: 1.1 ✅ D. Compilation error ❌ E. Runtime error
Explanation: 1. Method Overloading with Generics: • There are two overloaded findMax methods, one using extends Number and the other using extends Comparable<T>. • findMax(List<T extends Number>): Compares Number values using doubleValue() for comparison. • findMax(List<T extends Comparable<T>>): Compares values using the compareTo method, which is available for all classes implementing Comparable.
2. Type Inference and Ambiguity: • When the findMax method is called with List<Integer> or List<Double>, Java tries to infer which method to use. • Both Integer and Double implement Comparable<T>, so both methods are applicable. • This results in a method ambiguity error because Java cannot decide whether to use doubleValue() or compareTo() to compare the elements.
3. Compilation Error: • The ambiguity occurs because the Comparable interface is implemented by both Integer and Double, which causes the compiler to be unable to choose between the two overloaded methods.
❌ A. Max Integer: 4 Max Double: 3.3 ❌ B. Max Integer: 2 Max Double: 2.2 ❌ C. Max Integer: 1 Max Double: 1.1 ✅ D. Compilation error ❌ E. Runtime error
Explanation: 1. Method Overloading with Generics: • There are two overloaded findMax methods, one using extends Number and the other using extends Comparable<T>. • findMax(List<T extends Number>): Compares Number values using doubleValue() for comparison. • findMax(List<T extends Comparable<T>>): Compares values using the compareTo method, which is available for all classes implementing Comparable.
2. Type Inference and Ambiguity: • When the findMax method is called with List<Integer> or List<Double>, Java tries to infer which method to use. • Both Integer and Double implement Comparable<T>, so both methods are applicable. • This results in a method ambiguity error because Java cannot decide whether to use doubleValue() or compareTo() to compare the elements.
3. Compilation Error: • The ambiguity occurs because the Comparable interface is implemented by both Integer and Double, which causes the compiler to be unable to choose between the two overloaded methods.
Correct answer: D
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