Oracle 1z0-808 問題集

質問 1：
Given:

and the code fragment:
S2 sobj = new S2();
sobj.display(10, 100);
What is the result?
A. Parent 10
Child 10
Parent 1000
B. Child 10
Child 100
Parent 100
C. Child 10
Parent 100
Parent 100
D. A compile time error occurs.
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 2：
Which usage represents a valid way of compiling java source file with the name "Main"?
A. javac Main
B. java Main.java
C. java Main
D. java Main.class
E. javac Main.java
正解：E
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Given:
class Base {
public static void main(String[] args) {
System.out.println("Base " + args[2]);
}
}
public class Sub extends Base{
public static void main(String[] args) {
System.out.println("Overriden " + args[1]);
}
}
And the commands:
javac Sub.java
java Sub 10 20 30
What is the result?
A. Overridden 20
Base 30
B. Base 30
C. Base 30
Overridden 20
D. Overridden 20
正解：D

質問 4：
Given:

What is the result?
A. 3 4 5 6
B. 5 4 5 6
C. 3 4 3 6
D. 3 6 5 6
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 5：
Given the code in a file Traveler.java:

And the commands:
Javac Traveler.java
Java Traveler Java Duke
What is the result?
A. Happy Journey! Java
B. The program fails to execute due to a runtime error
C. Happy Journey! Duke
D. An exception is thrown at runtime
正解：C

質問 6：
Given:

What is the result?
A. C B A
B. C
C. A B C
D. Compilation fails at line n1 and line n2
正解：A

質問 7：
Given:
class MarksOutOfBoundsException extends IndexOutOfBoundsException { }
public class GradingProcess {
void verify(int marks) throws IndexOutOfBoundsException { if (marks >
100) {
throw new MarksOutOfBoundsException();
}
if (marks > 50) {
System.out.print("Pass");
} else {
System.out.print("Fail");
}
}
public static void main(String[] args) {
int marks = Integer.parseInt(args[2]);
try {
new GradingProcess().verify(marks);
} catch (Exception e) {
System.out.print(e.getClass());
}
}
}
And the command line invocation:
java GradingProcess 89 50 104
What is the result?
A. class IndexOutOfBoundsException
B. Pass
C. Fail
D. class Excpetion
E. class MarksOutOfBoundsException
正解：E

質問 8：
Given:
import java.util.*;
public class Ref {
public static void main(String[] args) {
StringBuilder s1 = new StringBuilder("Hello Java!");
String s2 = s1.toString();
List<String> lst = new ArrayList<String>();
lst.add(s2);
System.out.println(s1.getClass());
System.out.println(s2.getClass());
System.out.println(lst.getClass());
}
}
What is the result?
A. class java.lang.Object
class java.lang. Object
class java.util.Collection
B. class java.lang.String
class java.lang.String
class java.util.ArrayList
C. class java.lang.StringBuilder
class java.lang.String
class java.util.ArrayList
D. class java.lang.StringBuilder
class java.lang.String
class java.util.List
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 9：
Given:

What is the result?
A. 2
B. Compilation fails
C. 1
D. The loop executes infinite times
E. 1
正解：D