Scja Sample Questions

SCJA SAMPLE QUESTIONS BY SUN MICROSYSTEM Q.1 You are creating a space flight simulation for a start-up aeronautics company. This simulation program must calculate the orbital mechanics and display the flight path on a graphics screen. What type of data is most appropriate for calculating the orbital mechanics equations? A

pixel

B

boolean

C

integer

D

floating point

E

enumerated type

Ans-D

Q.2 Which two are required for proper information hiding? (Choose two.) A

All attributes must be marked with hidden.

B

All attributes must be marked with private.

C

Internal methods must be marked with hidden.

D

Internal methods must be marked with private.

E

All attributes must be given public accessor and mutator methods.

F

All attributes must be given exposed accessor and mutator methods.

Ans – B,D

Q.3 Click the Exhibit button. a----b Which two are true? (Choose two.) A

The multiplicity on the endpoint for class B is undefined.

B

The multiplicity on the endpoint for class B is implicitly one.

C

The arrow between class A and class B is an inheritance relationship.

D

An instance of class A will have a means to navigate to an instance of class B.

Ans- A Q.4 Click the Exhibit button.

A class MyClass { - x : int; - y : int; + z : int; - ch : char; + vel : float; + acc : float; } B class MyClass { private x : int; private y : int; public z : int; private ch : char; public vel : float; public acc : float; }

C class MyClass { - int x; - int y; + int z; - char ch; + float vel; + float acc; } D class MyClass { private int x; private int y; public int z; private char ch; public float vel; public float acc; } E class MyClass { private: int x; int y; char ch; public: int z; float vel; float acc;

} Ans- D Q.5 Which statement declares a floating point variable and assigns it the initial value of 100? A

float var = 100.0;

B

float var = 100.0F;

C

var : float = 100.0;

D

var : float = 100.0F;

Ans-B

Q.6 Given: x = "abcedfghijklmnopqrstuvwxyz" y = "lmno" Which line of code will remove the y string from the x string, and store it in the z variable? A

z=x-y

B

z = x.remove(y)

C

z = x.substract(y)

D

z = x.replace(y, "")

Ans- D Q.7 Which package contains APIs that are useful for distributed programming and communication? A

java.awt

B

java.net

C

java.util

D

javax.swing

Java SE API documentation.

Ans- B Q.8 Click the Exhibit button.

A

SQL

B

HTTP

C

JDBC

D

RDBMS

E

Java Beans

F

Entity Beans

Ans A,D

Q.9 Which two types of applications are appropriate for J2ME? (Choose two.) A

games

B

word processing

C

remote data collection

D

air traffic control system

Ans A,C Q.10 Which describes the role of servlet developer? A

a Java programmer who creates programs that execute on cell phones

B

a Java programmer who creates classes that respond to HTTP requests

C

a web designer who generates dynamic web pages to create user interfaces

D a Java programmer who creates components that represent data in a relational database Ans - B