OCJP Study 10

OCJP(Java 6) 기출문제 연습 10(91~100)

PC나 스마트폰에서도 동일하게 실행되므로 장소를 가리지 않고 OCJP(JAVA 6) 국제 자격증을 목표로 학습할 수 있다.

QUESTION 91
Click the Exhibit button.
Given the fully-qualified class names:
com.foo.bar.Dog
com.foo.bar.blatz.Book
com.bar.Car
com.bar.blatz.Sun
Which graph represents the correct directory structure for a JAR file from which those classes can be used by the compiler and JVM?(그림이 포함된 문제이나 사정상 첨부하지 못했음)

A. Jar A
B. Jar B
C. Jar C
D. Jar D
E. Jar E

A

설명없음

QUESTION 92
Click the Exhibit button.
Given: ClassA a = new ClassA();
a.methodA();
10. public class ClassA {
11. public void methodA() {
12. ClassB classB = new ClassB();
13. classB.getValue();
14. }
15. }

And:
20. class ClassB {
21. public ClassC classC;
22.
23. public String getValue() {
24. return classC.getValue();
25. }
26. }

And:
30. class ClassC {
31. public String value;
32.
33. public String getValue() {
34. value = "ClassB";
35. return value;
36. }
37. }
What is the result?

A. Compilation fails.
B. ClassC is displayed.
C. The code runs with no output.
D. An exception is thrown at runtime.

D

The classC object ins't instantiated.
ZZZ

QUESTION 93
Given:
interface Foo { int bar(); }
public class Sprite {
public int fubar( Foo foo ) { return foo.bar(); }
public void testFoo() {
fubar(
//insert code here 15
);
}
}
Which code, inserted at line 15, allows the class Sprite to compile?

A. Foo { public int bar() { return 1; }
B. new Foo { public int bar() { return 1; }
C. new Foo() { public int bar() { return 1; }
D. new class Foo { public int bar() { return 1; }

C

설명없음

QUESTION 94
Given:
11. public enum Title {
12. MR("Mr."), MRS("Mrs."), MS("Ms.");
13. private final String title;
14. private Title(String t) { title = t; }
15. public String format(String last, String first) {
16. return title + " " + first + " " + last;
17. }
18. }
public static void main(String[] args) {
System.out.println(Title.MR.format("Doe", "John"));
}
What is the result?

A. Mr. John Doe
B. An exception is thrown at runtime.
C. Compilation fails because of an error in line 12.
D. Compilation fails because of an error in line 15.
E. Compilation fails because of an error in line 20.

A

설명없음

QUESTION 95
Given the following six method names:
addListener
addMouseListener
setMouseListener
deleteMouseListener
removeMouseListener
registerMouseListener
How many of these method names follow JavaBean Listener naming rules?

A. 1
B. 2
C. 3
D. 4
E. 5

B

addMouseListener and removeMouseListener

QUESTION 96
Given:
class Line {
public static class Point {}
}
class Triangle {
public Triangle(){
// insert code here
}
}
Which code, inserted at line 15, creates an instance of the Point class defined in Line?

A. Point p = new Point();
B. Line.Point p = new Line.Point();
C. The Point class cannot be instatiated at line 15.
D. Line l = new Line() ; l.Point p = new l.Point();

B

설명없음

QUESTION 96
Given
11. public interface Status {
12. /* insert code here */ int MY_VALUE = 10;
13. }
Which three are valid on line 12? (Choose three.)

A. final
B. static
C. native
D. public
E. private
F. abstract
G. protected

A,B,D

설명없음

QUESTION 98
Click the Exhibit button.
Given this code from Class B:
25. A a1 = new A();
26. A a2 = new A();
27. A a3 = new A();
28. System.out.println(A.getInstanceCount());
What is the result?

1. public class A{
2.
3. private int counter = 0;
4.
5. public static int getInstanceCount() {
6. return counter;
7. }
8.
9. public A() {
10. counter++;
11. }
12.
13.}

A. Compilation of class A fails.
B. Line 28 prints the value 3 to System.out.
C. Line 28 prints the value 1 to System.out.
D. A runtime error occurs when line 25 executes.
E. Compilation fails because of an error on line 28.

A

Error in line 6: "Cannot make a static reference to the non-static field counter"
ZZZ

QUESTION 99
Given classes defined in two different files:
1. package util;
2. public class BitUtils {
3. public static void process(byte[] b) { /* more code here */ }
4. }
1. package app;
2. public class SomeApp {
3. public static void main(String[] args) {
4. byte[] bytes = new byte[256];
5. // insert code here
6. }
7. }
What is required at line 5 in class SomeApp to use the process method of BitUtils?

A. process(bytes);
B. BitUtils.process(bytes);
C. util.BitUtils.process(bytes);
D. SomeApp cannot use methods in BitUtils.
E. import util.BitUtils.*; process(bytes);

C

설명없음

QUESTION 100
Click the Exhibit button.
Which three code fragments, added individually at line 29, produce the output 100? (Choose three.)

class Inner {
private int x;
public void setX( int x ){ this.x = x; }
public int getX(){ return x;}
}
class Outer {
private Inner y;
public void setY( Inner y ){ this.y = y; }
public Inner getY() { return y; }
}
public class Gamma {
public static void main(String[] args) {
Outer o = new Outer();
Inner i = new Inner();
int n = 10;
i.setX(n);
o.setY(i);
// insert code here 29
System.out.println(o.getY().getX());
}
}

A. n = 100;
B. i.setX( 100 );
C. o.getY().setX( 100 );
D. i = new Inner(); i.setX( 100 );
E. o.setY( i ); i = new Inner(); i.setX( 100 );
F. i = new Inner(); i.setX( 100 ); o.setY( i );

B,C,F

설명없음