<div class="ugc-base question-body-text">
<div class=""><p><strong>4. The question refer to the following
declarations.</strong></p>
<p>public class Point</p>
<p>{</p>
<p>private double myX;</p>
<p>private double myyY;</p>
<p>// postcondition: this Point has coordinates (0,0)</p>
<p>public Point ()</p>
<p>{ /* implementation not shown */ }</p>
<p>// postcondition: this Point has coordinates (x,y)</p>
<p>public Point(double x, double y)</p>
<p>{ /* implementation not shown */ }</p>
<p>// other methods not shown</p>
<p>}</p>
<p>public class Circle</p>
<p>{</p>
<p>private Point myCenter;</p>
<p>private double myRadius;</p>
<p>// postcondition: this Circle has center at (0, 0) and radius
0.0</p>
<p>public Circle()</p>
<p>{ /* implementation not shown */ }</p>
<p>// postcondition: this Circle has the given center and
radius</p>
<p>public Circle(Point center, double radius)</p>
<p>{ /* implementation not shown */ }</p>
<p>// other methods not shown</p>
<p>}</p>
<p>In a client program which of the following correctly declares
and initializes  Circle circ  with center at
(29.5, 33.0) and radius 10.0 ?</p>
<ul>
<li>
<p>Circle circ = new Circle(29.5, 33.0, 10.0);</p>
<p>Circle circ = new Circle(29.5, 33.0, 10.0);,</p>
<p>A</p>
</li>
<li>
<p>Circle circ = new Circle((29.5, 33.0), 10.0);</p>
<p>Circle circ = new Circle((29.5, 33.0), 10.0);</p>
<p>B</p>
</li>
<li>
<p>Circle circ = new Circle(new Point (29.5, 33.0), 10.0);</p>
<p>Circle circ = new Circle(new Point (29.5, 33.0), 10.0);</p>
<p>C</p>
</li>
<li>
<p>Circle circ = new Circle();</p>
<p>circ.myCenter = new Point(29.5, 33.0);</p>
<p>circ.myRadius = 10.0;</p>
<p>Circle circ = new Circle();, , circ.myCenter = new Point(29.5,
33.0);, , circ.myRadius = 10.0;,</p>
<p>D</p>
</li>
<li>
<p>Circle circ = new Circle();</p>
<p>circ.myCenter = new Point();</p>
<p>circ.myCenter.myX = 29.5;</p>
<p>circ.myCenter.myY = 33.0;</p>
<p>cire.myRadius = 10.0;</p>
</li>
</ul>
<p><strong>5.  </strong></p>
<p>Consider the following classes.</p>
<p>public class Base</p>
<p>{</p>
<p>public Base()</p>
<p>{</p>
<p>System.out.print("Base" + " ");</p>
<p>}</p>
<p>}</p>
<p>public class Derived extends Base</p>
<p>{</p>
<p>public Derived()</p>
<p>{</p>
<p>System.out.print("Derived" + " ");</p>
<p>}</p>
<p>}</p>
<p>Assume that the following statement appears in another
class.</p>
<p>Derived d1 = new Derived();</p>
<p>What is printed as a result of executing the statement?</p>
<ul>
<li>
<p>Nothing is printed because the statement is a variable
declaration.</p>
<p>Nothing is printed because the statement is a variable
declaration.</p>
<p>A</p>
</li>
<li>
<p>Base</p>
<p>Base</p>
<p>B</p>
</li>
<li>
<p>Derived</p>
<p>Derived</p>
<p>C</p>
</li>
<li>
<p>Base Derived</p>
<p>Base Derived</p>
<p>D</p>
</li>
<li>
<p>Derived Base</p>
<p>Derived Base</p>
<p>E</p>
</li>
</ul>
<p><strong>6.</strong></p>
<p>Consider the following declaration of the class NumSequence,
which has a constructor that is intended to initialize the instance
variable seq to an ArrayList of numberOfValues random
floating-point values in the range [0.0, 1.0).</p>
<p>public class NumSequence</p>
<p>{</p>
<p>private ArrayList&lt;Double&gt; seq;</p>
<p>// <strong>precondition:</strong> numberOfValues &gt; 0</p>
<p>// <strong>postcondition</strong>: seq has been initialized to
an ArrayList of</p>
<p>// length numberOfValues; each element of seq</p>
<p>// contains a random Double in the range [0.0, 1.0)</p>
<p>public NumSequence(int numberOfValues)</p>
<p>{</p>
<p>/* <em>missing code</em> */</p>
<p>}</p>
<p>}</p>
<p>Which of the following code segments could be used to replace /*
<em>missing code</em> */ so that the constructor will work as
intended?</p>
<p>I. ArrayList&lt;Double&gt; seq = new
ArrayList&lt;Double&gt;();</p>
<p>for (int k = 0; k &lt; numberOfValues; k++)</p>
<p>seq.add(new Double(Math.random()));</p>
<p>II. seq = new ArrayList&lt;Double&gt;();</p>
<p>for (int k = 0; k &lt; numberOfValues; k++)</p>
<p>seq.add(new Double(Math.random()));</p>
<p>III.   ArrayList&lt;Double&gt; temp = new
ArrayList&lt;Double&gt;();</p>
<p>for (int k = 0; k &lt; numberOfValues; k++)</p>
<p>temp.add(new Double(Math.random()));</p>
<p>seq = temp;</p>
<ul>
<li>
<p>II only</p>
<p>II only</p>
<p>A</p>
</li>
<li>
<p>III only</p>
<p>III only</p>
<p>B</p>
</li>
<li>
<p>I and II</p>
<p>I and II</p>
<p>C</p>
</li>
<li>
<p>I and III</p>
<p>I and III</p>
<p>D</p>
</li>
<li>
<p>II and III</p>
<p>II and III</p>
<p>E</p>
</li>
</ul>
</div>
</div>

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