Java Technologies

Java Technologies - Upwork

Question: How many objects are created by the following code?
Object a, b, c, d, e; e = new Object (); b = a = e; e = new Object ();
A
2

B
5

C
4

D
That code is invalid.

Note: Not available
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Question: Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?
A
Collection

B
Set

C
Map

D
SortedSet

Note: Not available
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Question: Which of the following is the correct syntax for creating a Session object?
A
HttpSession ses=request.getSession(true);

B
HttpSession ses=getSession(true);

C
HttpSession ses=request.getSession();

D
HttpSession ses=request.getSessionObject(true);

E
HttpSession ses=response.getSession(true);

Note: Not available
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Question: Which statement is true about the given code?public class Test78 {
        public static void main(String[] args) throws Exception {
                new JBean().setHeight(1).setWidth(2).setDepth(3).setDensity(9);
        }
}
class JBean {
        private int height, width, depth, density;
        public JBean setHeight  (int h) { this.height  = h; return this; }
        public JBean setWidth   (int w) { this.width   = w; return this; }
        public JBean setDepth   (int d) { this.depth   = d; return this; }
        public JBean setDensity (int d) { this.density = d; return this; }
}
AThe code does not compile, because two setters have a formal parameter with the same name.

BThe setters of the JBean class are JavaBean-compliant.

CThe code compiles, but throws a NullPointerException at run-time.

DThe code compiles and runs.

Note: Not available

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Question: Choose all valid forms of the argument list for the FileOutputStream constructor shown below:
A
FileOutputStream( FileDescriptor fd )

B
FileOutputStream( String n, boolean a )

C
FileOutputStream( boolean a )

D
FileOutputStream()

E
FileOutputStream( File f )

Note: Not available
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Question: Which of the following methods should be invoked by the container to get a bean back to its working state?
A
EJBPassivate()

B
EJBActivate()

C
EJBRemove()

D
EJBOpen()

E
EJBActivation()

Note: Not available
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Question: Select all true statements:
A
An abstract class can have non-abstract methods.

B
A non-abstract class can have abstract methods.

C
If a non-abstract class implements interface, it must implement all the methods of the interface.

D
If a non-abstract class inherits abstract methods from its abstract superclass, it must implement the inherited abstract methods.

Note: Not available
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Question: Which option could be used to see additional warnings about code that mixes legacy code with code that uses generics?
A
-Xlint:unchecked

B
-Xlint:-unchecked

C
-Xswitchcheck or -Xlint:fallthrough depending on the version of Java

D
-classpath or -cp

Note: Not available
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Question: Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?
A
String value=req.getInitParameter(10);

B
String value=req.getInitParameter("product");

C
String value=res.getParameter("product");

D
String value=req.getParameter("product");

Note: Not available
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Question: Which of these is not an event listener adapter defined in the java.awt.event package?
A
ActionAdapter

B
MouseListener

C
WindowAdapter

D
FocusListener

Note: Not available
1. Report

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Question: How many objects are created by the following code?
Object a, b, c, d, e; e = new Object (); b = a = e; e = new Object ();

Question: Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?

Question: Which of the following is the correct syntax for creating a Session object?

Question: Choose all valid forms of the argument list for the FileOutputStream constructor shown below:

Question: Which of the following methods should be invoked by the container to get a bean back to its working state?

Question: Select all true statements:

Question: Which option could be used to see additional warnings about code that mixes legacy code with code that uses generics?

Question: Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?

Question: Which of these is not an event listener adapter defined in the java.awt.event package?

Question: How many objects are created by the following code?Object a, b, c, d, e; e = new Object (); b = a = e; e = new Object ();

Question: Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?

Question: Which of the following is the correct syntax for creating a Session object?

Question: Choose all valid forms of the argument list for the FileOutputStream constructor shown below:

Question: Which of the following methods should be invoked by the container to get a bean back to its working state?

Question: Select all true statements:

Question: Which option could be used to see additional warnings about code that mixes legacy code with code that uses generics?

Question: Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?

Question: Which of these is not an event listener adapter defined in the java.awt.event package?

Question: How many objects are created by the following code?
Object a, b, c, d, e; e = new Object (); b = a = e; e = new Object ();