OCJP Study 16

OCJP(Java 6) 기출문제 연습 16(151~160)

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

QUESTION 151
Given:
public class Drink implements Comparable {
public String name;
public int compareTo(Object o) {
return 0;
}
}
and:
Drink one = new Drink();
Drink two = new Drink();
one.name= "Coffee";
two.name= "Tea";
TreeSet set = new TreeSet();
set.add(one);
set.add(two);
A programmer iterates over the TreeSet and prints the name of each Drink object.
What is the result?

A. Tea
B. Coffee
C. Coffee
Tea
D. Compilation fails.
E. The code runs with no output.
F. An exception is thrown at runtime.

B

설명없음

QUESTION 152
A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable.
Which implementation of MinMax will compile?

A. class MinMax<E extends Comparable<E>> {
E min = null;
E max = null;
public MinMax() {}
public void put(E value) { /* store min or max */ }
B. class MinMax<E implements Comparable<E>> {
E min = null;
E max = null;
public MinMax() {}
public void put(E value) { /* store min or max */ }
C. class MinMax<E extends Comparable<E>> {
<E> E min = null;
<E> E max = null;
public MinMax() {}
public <E> void put(E value) { /* store min or max */ }
D. class MinMax<E implements Comparable<E>> {
<E> E min = null;
<E> E max = null;
public MinMax() {}
public <E> void put(E value) { /* store min or max */ }

A

설명없음

QUESTION 153
Given:
1. import java.util.*;
2. public class Example {
3. public static void main(String[] args) {
4. // insert code here
5. set.add(new Integer(2));
6. set.add(new Integer(1));
7. System.out.println(set);
8. }
9. }
Which code, inserted at line 4, guarantees that this program will output [1, 2]?

A. Set set = new TreeSet();
B. Set set = new HashSet();
C. Set set = new SortedSet();
D. List set = new SortedList();
E. Set set = new LinkedHashSet();

A,B

설명없음

QUESTION 154
Given:
1.
2.
3.
4.
5. class A {
6. void foo() throws Exception { throw new Exception(); }
7. }
8. class SubB2 extends A {
9. void foo() { System.out.println("B "); }
10.}
11.class Tester {
12. public static void main(String[] args) {
13. A a = new SubB2();
14. a.foo();
15. }
16.}
What is the result?

A. B
B. B, followed by an Exception.
C. Compilation fails due to an error on line 9.
D. Compilation fails due to an error on line 14.
E. An Exception is thrown with no other output.

D

error "Unhandled exception type Exception" on line 14
ZZZ

QUESTION 155
Given:
try {
ResourceConnection con = resourceFactory.getConnection();
Results r = con.query("GET INFO FROM CUSTOMER"); // Linea 86
info = r.getData(); 88. con.close();
} catch (ResourceException re) {
errorLog.write(re.getMessage());
}
return info;
Which statement is true if a ResourceException is thrown on line 86?

A. Line 92 will not execute.
B. The connection will not be retrieved in line 85.
C. The resource connection will not be closed on line 88.
D. The enclosing method will throw an exception to its caller.

C

설명없음

QUESTION 156
Given:
public class Breaker {
static String o = "";
public static void main(String[] args) {
z: o = o + 2;
for (int x = 3; x < 8; x++) {
if (x == 4)
break;
if (x == 6)
break z;
o = o + x;
}
System.out.println(o);
}
}
What is the result?

A. 23
B. 234
C. 235
D. 2345
E. 2357
F. 23457
G. Compilation fails.

G

The label z: should be right before the for to compile. And if it executes the output would be 23
ZZZ

QUESTION 157
Given:
public void go(int x) {
assert (x > 0); //Line 12
switch(x) {
case 2: ;
default: assert false; //Line 15
}
}
private void go2(int x) { assert (x < 0); } //Line 18
Which statement is true?

A. All of the assert statements are used appropriately.
B. Only the assert statement on line 12 is used appropriately.
C. Only the assert statement on line 15 is used appropriately.
D. Only the assert statement on line 18 is used appropriately.
E. Only the assert statements on lines 12 and 15 are used appropriately.
F. Only the assert statements on lines 12 and 18 are used appropriately.
G. Only the assert statements on lines 15 and 18 are used appropriately.

G

설명없음

QUESTION 158
Given:
public static void main(String[] args) {
try {
args = null;
args[0] = "test";
System.out.println(args[0]);
} catch (Exception ex) {
System.out.println("Exception");
} catch (NullPointerException npe) {
System.out.println("NullPointerException");
}
}
What is the result?

A. test
B. Exception
C. Compilation fails.
D. NullPointerException

C

It gives the compilation error "Unreachable catch block for NullPointerException. It is already handled by the catch block for Exception" on line with the second catch.
ZZZ

QUESTION 159
Given:
public static void main(String[] args) {
for (int i = 0; i <= 10; i++) {
if (i > 6) break;
}
System.out.println(i);
}
What is the result?

A. 6
B. 7
C. 10
D. 11
E. Compilation fails.
F. An exception is thrown at runtime.

E

error on println line: "i cannot be resolved to a variable"
ZZZ

QUESTION 160
Given:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.class X { public void foo() { System.out.print("X "); } }
12.
13.public class SubB extends X {
14. public void foo() throws RuntimeException {
15. super.foo();
16. if (true) throw new RuntimeException();
17. System.out.print("B ");
18. }
19. public static void main(String[] args) {
20. new SubB().foo();
21. }
22.}
What is the result?

A. X, followed by an Exception.
B. No output, and an Exception is thrown.
C. Compilation fails due to an error on line 14.
D. Compilation fails due to an error on line 16.
E. Compilation fails due to an error on line 17.
F. X, followed by an Exception, followed by B.

A

X Exception in thread "main" java.lang.RuntimeException
at SubB.foo(SubB.java:5)
at SubB.main(SubB.java:9)