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OCPJP 6 Mock Exams - NavigableMap (10 Questions)

2) What will be the output of the following program?

package navmap;

import java.util.HashMap;
import java.util.NavigableMap;
import java.util.TreeMap;

public class Ques01 {

	public static void main(String[] args) {
		
		NavigableMap<String, String> colors = new HashMap<String, String>();
		
		colors.put("RED", "Red");
		colors.put("BLUE", "Blue");
		System.out.println(colors.get("BLUE"));
	}
}

1. The program will output 'null'.
2. The program will return 'Blue'.
3. The program won't compile because of compilation errors.
4. The program will throw a run-time exception.

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Answer

2) c.

The program won't compile since the class HashMap doesn't implement the NavigableMap interface.

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