Which statement is true for the class java.util.HashSet?

1.

Which statement is true for the class java.util.HashSet?

A. The elements in the collection are ordered.

B. The collection is guaranteed to be immutable.

C. The elements in the collection are guaranteed to be unique.

D. The elements in the collection are accessed using a unique key.

Answer» D. The elements in the collection are accessed using a unique key.

Discussion

No Comment Found

Related MCQs

<pre><code class="java">class HappyGarbage01 { public static void main(String args[]) { HappyGarbage01 h = new HappyGarbage01(); h.methodA(); /* Line 6 */ } Object methodA() { Object obj1 = new Object(); Object [] obj2 = new Object[1]; obj2[0] = obj1; obj1 = null; return obj2[0]; } } </code></pre> Where will be the most chance of the garbage collector being invoked?

What will be the output of the program? <pre><code class="java">public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } } } </code></pre>

Which one is a valid declaration of a boolean?

Which one of the following will declare an array and initialize it with five numbers?

Which three are valid declarations of a float? <ol class="java-ol-1234"> <li>float f1 = -343;</li> <li>float f2 = 3.14;</li> <li>float f3 = 0x12345;</li> <li>float f4 = 42e7;</li> <li>float f5 = 2001.0D;</li> <li>float f6 = 2.81F;</li> </ol>

Which is a valid declarations of a String?

Which three are legal array declarations? <ol class="java-ol-1234"> <li>int [] myScores [];</li> <li>char [] myChars;</li> <li>int [6] myScores;</li> <li>Dog myDogs [];</li> <li>Dog myDogs [7];</li> </ol>

Which three are valid declarations of a char? <ol class="java-ol-1234"> <li>char c1 = 064770;</li> <li>char c2 = 'face';</li> <li>char c3 = 0xbeef;</li> <li>char c4 = u0022;</li> <li>char c5 = ' iface';</li> <li>char c6 = ' uface';</li> </ol>

Which is the valid declarations within an interface definition?

<pre><code class="java">public interface Foo { int k = 4; /* Line 3 */ } </code></pre> Which three piece of codes are equivalent to line 3? <ol class="java-ol-1234"> <li>final int k = 4;</li> <li>public int k = 4;</li> <li>static int k = 4;</li> <li>abstract int k = 4;</li> <li>volatile int k = 4;</li> <li>protected int k = 4;</li> </ol>

1.	Which statement is true for the class java.util.HashSet?
A.	The elements in the collection are ordered.
B.	The collection is guaranteed to be immutable.
C.	The elements in the collection are guaranteed to be unique.
D.	The elements in the collection are accessed using a unique key.
Answer» D. The elements in the collection are accessed using a unique key.

Which statement is true for the class java.util.HashSet?

Discussion

No Comment Found

Related MCQs

Reply to Comment