Solve this multiple-choice question and choose the correct option.

Home » Java Programming » Objects and Collections

Java — Which interface provides capability to store objects using key-value pairs?

Difficulty: Easy

java.util.Map
java.util.Set
java.util.List
java.util.Collection

Correct Answer: java.util.Map

Explanation:

Introduction / Context:This tests knowledge of the Map interface in the Java Collections Framework.

Concept / Approach:Map defines methods to store key-value pairs, where keys are unique and values can be retrieved by keys.

Why Other Options Are Wrong:

Set → stores unique elements only, no key-value.
List → ordered collection of elements, allows duplicates.
Collection → root interface, but no key-value mapping.

Final Answer:java.util.Map

← Previous Question Next Question→

More Questions from Objects and Collections

Java — Which of the following are Java reserved words? (run, import, default, implement)
Java — Which collection class allows key-value associations and provides synchronization?
Java — Which is a valid declaration of a float value?
Java TreeSet iteration order and duplicate handling: what sequence is printed? TreeSet map = new TreeSet(); map.add("one"); map.add("two"); map.add("three"); map.add("four"); map.add("one"); // duplicate Iterator it = map.iterator(); while (it.hasNext()) { System.out.print(it.next() + " "); }
Static array reference default value vs element access: what happens when printing x[0]? public class Test { private static int[] x; // reference not initialized → null public static void main(String[] args) { System.out.println(x[0]); } }
Which interfaces does Vector.elements() return, and how do instanceof tests evaluate? import java.util.*; class H { public static void main (String[] args) { Object x = new Vector().elements(); System.out.print((x instanceof Enumeration) + ","); System.out.print((x instanceof Iterator) + ","); System.out.print(x instanceof ListIterator); } }
Packages, access modifiers, and top-level classes: will this code compile? package foo; import java.util.Vector; // Line 2 private class MyVector extends Vector { int i = 1; // Line 5 public MyVector() { i = 2; } } public class MyNewVector extends MyVector { public MyNewVector() { i = 4; // Line 15 } public static void main (String args[]) { MyVector v = new MyNewVector(); // Line 19 } }
Default values in a newly allocated float array: what exactly prints for f[0]? public class Test { private static float[] f = new float[2]; public static void main (String[] args) { System.out.println("f[0] = " + f[0]); } }
Which interfaces does ArrayList.iterator() implement? Evaluate the instanceof results. import java.util.*; class I { public static void main (String[] args) { Object i = new ArrayList().iterator(); System.out.print((i instanceof List) + ","); System.out.print((i instanceof Iterator) + ","); System.out.print(i instanceof ListIterator); } }
Using NULL vs null in Java: what does this program do? public class Test { public static void main (String args[]) { String str = NULL; System.out.println(str); } }

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion