Scjp (310-055) Exam I
Self-study questions for Sun Certified Java Programmer (SCJP) (310-055). God speed!
- 1.Given the following, 1. interface Base {2. boolean m1 ();3. byte m2(short s);4. } Which code fragments will compile? (Choose all that apply.)
- A.
Interface Base2 implements Base { }
- B.
Abstract class Class2 extends Base { public boolean ml() { return true; } }
- C.
Abstract class Class2 implements Base { }
- D.
# abstract class Class2. implements Base { public boolean m1() { return (true); } }
- E.
Class Class2 implements Base { boolean m1( ) { return false; } byte m2(short s) { return 42; } }
- 2.Which declare a compilable abstract class? (Choose all that apply.)
- A.
Public abstract class Canine { public Bark speak(); }
- B.
Public abstract class Canine { public Bark speak() { } }
- C.
Public class Canine { public abstract Bark speak(); }
- D.
Public class Canine abstract { public abstract Bark speak(); }
- 3.Which is true? (Choose all that apply. )
- A.
"X extends Y" is correct if and only if X is a class and Y is an interface.
- B.
"X extends Y" is correct if and only if X is an interface and Y is a class.
- C.
"X extends Y" is correct if X and Y are either both classes or both interfaces.
- D.
"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.
- 4.Which are valid declarations? (Choose all that apply.)
- A.
Int $x;
- B.
Int 123;
- C.
Int _123;
- D.
Int #dim;
- E.
Int central_sales_region_Summer_2005_gross_sales;
- 5.Which method names follow the JavaBeans standard? (Choose all that apply.)
- A.
AddSize
- B.
GetCust
- C.
DeleteRep
- D.
IsColorado
- E.
PutDimensions
- 6.Given:1. class Voop {2. public static void main(String [] args) {3. doStuff(1);4. doStuff(1, 2);5. }6. // insert code here7. } Which, inserted independently at line 6, will compile? (Choose all that apply.)
- A.
Static void doStuff(int... doArgs) { }
- B.
Static void doStuff (int [] doArgs) { }
- C.
Static void doStuff(int doArgs...) { }
- D.
Static void doStuff(int... doArgs, int y) { }
- E.
Static void doStuff(int x, int... doArgs) { }
- 7.Which statement(s) are true? (Choose all that apply.)
- A.
Has-a relationships always rely on inheritance.
- B.
Has-a relationships always rely on instance variables.
- C.
Has-a relationships always require at least two class types
- D.
Has-a relationships always rely on polymorphism.
- E.
Has-a relationships are always tightly coupled.
- 8.Given: class Clidders { public final void flipper() { System.out.println("Clidder"); }}public class Clidlets extends Clidders { public void flipper() { System.out.println("Flip a Clidlet"); super.flipper(); } public static void main(String [] args) { new Clidlets().flipper(); }} What is the result?
- A.
Flip a Clidlet
- B.
Flip a Clidde
- C.
Flip a Clidder Flip a Clidlet
- D.
# Flip a Clidlet Flip a Clidder
- E.
Compilation fails.
- 9.Given: public abstract interface Frobnicate { public void twiddle(String s) ; } Which is a correct class? (Choose all that apply.)
- A.
Public abstract class Frob implements Frobnicate { public abstract void twiddle(String s){} }
- B.
Public abstract class Frob implements Frobnicate { }
- C.
Public class Frob extends Frobnicate { public void twiddle(Integer i) { } }
- D.
Public class Frob implements Frobnicate { public void twiddle(Integer i) { } }
- E.
Public class Frob implements Frobnicate { public void twiddle(String i) { } public void twiddle(Integer s) { } }
- 10.Given: class Top { public Top(String s) { System.out.print("B"); }}public class Bottom2 extends Top { public Bottom2(String s) { System.out.print("D"); } public static void main(String [] args) { new Bottom2("C"); System.out.println(" "); }}What is the result?
- A.
BD
- B.
DB
- C.
BDC
- D.
DBC
- E.
Compilation fails.
- 11.Select the two statements that best indicate a situation with low coupling. (Choose two.)
- A.
The attributes of the class are all private.
- B.
The class refers to a small number of other objects.
- C.
The object contains only a small number of variables.
- D.
The reference variable is declared for an interface type, not a class. The interface provides a small number of methods.
- E.
It is unlikely that changes made to one class will require any changes in another.
- 12.Given: class Clidder { private final void flipper() { System.out.println ("Clidder"); }}public class Clidlet extends Clidder { public final void flipper() { System.out.println("Clidlet"); } public static void main(String [] args) { new Clidlet().flipper(); }} What is the result?
- A.
Clidlet
- B.
Clidder
- C.
Clidder Clidlet
- D.
Clidlet Clidder
- E.
Compilation fails.
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