Online Access Free 1Z0-850 Exam Questions

Which two are benefits when appropriately using polymorphism? (Choose two.)

• A.code that is more efficient at runtime
• B.code that is more flexible and reusable
• C.code that is protected from extension by other classes
• D.code that is faster at runtime
• E.code that is more dynamic at runtime

Which three are provided by the EJB tier in a multitier J2EE application? (Choose three.)

• A.dynamic content generation
• B.concurrency control
• C.security
• D.XML parsing
• E.transaction management

Given:
1 . class Test {
2 . public static void main(String args[]) {
3 . String str = "Hello!";
4 . String str2 = "Bye!";
5 . str += str2;
6 . str -= str2;
7 .
8 . if ( str == str2 ) {
9 . System.out.println("str = str2");
1 0. } else {
1 1. System.out.println("str != str2");
1 2. }
1 3. }
1 4. }
What is the result?

• A.The code runs with no output.
• B.str != str2
• C.str = str2
• D.Compilation fails.

Click the Exhibit button.
Which two classes can have two or more instances associated with a single instance of X.
(Choose two.)

• A.D
• B.B
• C.A
• D.C

You need to create a class Foo that will record the number of times the go() method is invoked on a particular instance of the class. Which solution correctly implements this goal?

• A.Declare a static variable invokeCount for the class Foo, and increment the variable within the go() method.
• B.Declare a method parameter invokeCount as the argument to the go() method, and increment the variable within the go() method.
• C.Declare a local variable invokeCount inside the go() method, and increment the variable within the go() method.
• D.Declare an instance variable invokeCount for the class Foo, and increment the variable within the go() method.