Oracle 1Z0-815 問題集

質問 1：
Given:

Which two statements are true if the method is added to Bar? (Choose two.)
A. public <T> List<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
B. public Collection<String> foo(Collection<String> arg) { ... } overrides Foo.foo.
C. public <T> Collection<T> bar(Collection<T> arg) { ... } overloads Foo.foo.
D. public <T> Iterable<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
E. public <T> Collection<T> foo(Collection<T> arg) { ... } overloads Foo.foo.
F. public <T> Collection<T> foo(Stream<T> arg) { ... } overloads Foo.foo.
正解：A,D

質問 2：
What makes Java dynamic?
A. At runtime, classes are loaded as needed, and new code modules can be loaded on demand.
B. The runtime can process machine language sources as well as executables from different language compilers.
C. The Java compiler uses reflection to test if class methods are supported by resources of a target platform.
D. The Java compiler preprocesses classes to run on specific target platforms.
正解：A

質問 3：
Given:

and omitting the throwsFooExceptionclause results in a compilation error.
Which statement is true about FooException?
A. The body of foo can throw FooException or one of its subclasses.
B. FooException is unchecked.
C. The body of foo can only throw FooException.
D. FooException is a subclass of RuntimeError.
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 4：
Given:
Automobile.java

Car.java

What must you do so that the code prints 4?
A. Remove the parameter from wheels method in line 3.
B. Replace the code in line 2 with Car ob = new Car();
C. Add @Override annotation in line 2.
D. Remove abstract keyword in line 1.
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 5：
Which is the correct order of possible statements in the structure of a Java class file?
A. package, class, import
B. import, package, class
C. import, class, package
D. package, import, class
E. class, package, import
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 6：
Given:

Which is true?
A. The compilation fails due to an error in line 9.
B. The compilation fails due to an error in line 7.
C. The compilation fails due to an error in line 10.
D. The compilation fails due to an error in line 4.
E. The compilation succeeds.
F. The compilation fails due to an error in line 6.
G. The compilation fails due to an error in line 2.
正解：A

質問 7：
Given:
public class MainMethod {
void main() {
System.out.println("one");
}
static void main(String args) {
System.out.println("two");
}
public static void main(String[] args) {
System.out.println("three");
}
void mina(Object[] args) {
System.out.println("four");
}
}
What is printed out when the program is excuted?
A. four
B. three
C. two
D. one
正解：B

質問 8：
Given:

What is the result?
A. SomeClass#methodA()
SomeClass#methodA()
B. AnotherClass#methodA()
SomeClass#methodA()
C. A ClassCastException is thrown at runtime.
D. SomeClass#methodA()
AnotherClass#methodA()
E. AnotherClass#methodA()
AnotherClass#methodA()
F. The compilation fails.
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 9：
Given:

Which three are true? (Choose three.)
A. f1.foo(c) prints Bonjour le monde!
B. b1.foo(c) prints Hello world!
C. f2.foo(c) prints Hello world!
D. f2.foo(c) prints Bonjour le monde!
E. b1.foo(c) prints Ol?Mundo!
F. f2.foo(c) prints Ol?Mundo!
G. f1.foo(c) prints Hello world!
H. f1.foo(c) prints Ol?Mundo!
I. b1.foo(c) prints Bonjour le monde!
正解：D,E,G