class Ping extends Utils { public static void main(String [] args) { Utils u = new Ping(); System.out.print(u.getInt(args[0])); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String x) throws Exception { return 7; } } And the following three possible changes: L1. Declare that main() throws an Exception. L2. Declare that Ping.getInt() throws an Exception. L3. Wrap the invocation of getInt() in a try / catch block. Which change(s) allow the code to compile? (Choose all that apply.)

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  1. Just L1 is sufficient.

  2. Just L2 is sufficient.

  3. Just L3 is sufficient.

  4. Both L1 and L2 are required.

  5. Both L1 and L3 are required.

  6. Both L3 and L2 are required.

Show answer
Correct Option: A,C

AI Explanation

To determine which changes allow the code to compile, let's go through each option:

Option A) Just L1 is sufficient. If we declare that main() throws an Exception, it means that the main() method will handle any exceptions thrown by the code within it. Since getInt() in the Utils class already throws an Exception, this change allows the code to compile.

Option B) Just L2 is sufficient. If we declare that Ping.getInt() throws an Exception, it means that any code calling getInt() must handle any exceptions thrown by it. However, the main() method in the Ping class does not handle exceptions, so this change would cause a compilation error.

Option C) Just L3 is sufficient. If we wrap the invocation of getInt() in a try/catch block, it means that we are handling any exceptions thrown by getInt() within the catch block. This change allows the code to compile because it ensures that exceptions thrown by getInt() are properly handled.

Option D) Both L1 and L2 are required. As explained in option B, declaring that Ping.getInt() throws an Exception would cause a compilation error since the main() method does not handle exceptions. Therefore, this option is not correct.

Option E) Both L1 and L3 are required. As explained in option A, declaring that main() throws an Exception allows the code to compile. Additionally, wrapping the invocation of getInt() in a try/catch block ensures that exceptions thrown by getInt() are handled. Therefore, this option is correct.

Option F) Both L3 and L2 are required. As explained in option B, declaring that Ping.getInt() throws an Exception would cause a compilation error. Therefore, this option is not correct.

The correct answer is A) Just L1 is sufficient and C) Just L3 is sufficient.

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