1Z0-850問題集、Oracle実際の試験問題

質問 1

Which three are char literals? (Choose three.)

A. /C/

B. '\uF00D'

C. '\n'

D. 'C'

E. "C"

F. 'ABC'

正解: B,C,D

質問 2

Given:
1 . public abstract class Wow {
2 . private int wow;
3 . public Wow(int wow) {
4 . this.wow = wow;
5 . }
6 . public void wow() { }
7 . private void wowza() { }
8 . }
Which is true about the class Wow?

A. It does NOT compile because an abstract class CANNOT have instance variables.

B. It does NOT compile because an abstract class must have at least one abstract method.

C. It compiles without error.

D. It does NOT compile because an abstract class must have a constructor with no arguments.

E. It does NOT compile because an abstract class CANNOT have private methods.

正解: C

質問 3

Given:
1 . class Test {
2 . public static void main(String args[]) {
3 . int num1 = 10, num2 = 20, result;
4 . result = calc(num1, num2);
5 . System.out.println(result);
6 . }
7 .
8 . // insert code here
9 . }
Which, inserted at line 8, produces the output 30?

A. static int calc(int n1, int n2) { return n1 + n2; }

B. public int calc(int n1, int n2) { return; }

C. static int calc(int n1, n2) { return n1, n2; };

D. static void calc(n1, n2) { return (n1 + n2); }

E. static int calc(int n1, int n2) { return; }

F. public int calc(int n1, int n2) { return n1 + n2; }

正解: A

質問 4

Given:
1 8. String s = " abcdcba ";
1 9. int x = 2;
2 0. s = s.trim();
2 1. if (s.length() < 8) {
2 2. x = s.indexOf('c', 3);
2 3. }
2 4. System.out.println("x = " + x);
What is the result?

A. x = 4

B. x = 3

C. x = 2

D. x = 5

E. x = 6

正解: A

質問 5

Given:
1 . public class Bar {
2 . int size;
3 . public static void main(String[] args) {
4 . Bar b = new Bar();
5 . b.size = 27;
6 . int i = b.go(b.size);
7 . System.out.print(b.size + " : " + i);
8 . }
9 . public int go(int size) {
1 0. size++;
1 1. return size;
1 2. }
1 3. }
What is the result?

A. Compilation fails.

B. 27 : 28

C. 28 : 28

D. 28 : 27

E. 27 : 27

正解: B

質問 6

Click the Exhibit button.
Which two are true? (Choose two.)

A. Deleting a Snip will cause its associated Grok to be deleted.

B. Deleting a Grok will cause a Plu to be deleted.

C. A Flux knows with which Grok it is associated.

D. Any Grok associated with a Flux must be deleted when the Flux is deleted.

E. A Grok knows with which Flux it is associated.

F. Deleting a Plu will cause a Grok to be deleted.

正解: B,C

質問 7

Given:
2 . class Test {
3 . public static void main(String args[]) {
4 . for (int i = 1; i < 5; i++) {
5 . if (i == 2) {
6 . continue;
7 . }
8 . System.out.print(" i = " + i);
9 . }
1 0. }
1 1. }
What is the result?

A. i = 1 i = 3 i = 4

B. Compilation fails.

C. i = 1 i = 2 i = 4 i = 5

D. i = 1 i = 2 i = 4

E. i = 1

F. i = 1 i = 3 i = 4 i = 5

G. The code runs with no output.

正解: A

質問 8

Given:
1 . class Test {
2 . public static void main(String[] args) {
3 . int num = 1;
4 . for (num = 0; num < 3; ++num ) {
5 . num *= 2;
6 . }
7 . System.out.println("num = " + (num++));
8 . }
9 . }
What is the result?

A. Compilation fails.

B. num = 3

C. num = 5

D. num = 2

E. num = 4

正解: B

質問 9

Click the Exhibit button.
Which code correctly implements the association between A and B?

A. class A { }
class B {
private A a;
}

B. class A {
private B[] b;
}
class B {
private A a;
}

C. class A {
private B b;
}
class B {
private A[] a;
}

D. class A {
private B b;
}
class B { }

E. class A { }
class B {
private A[] a;
}

F. class A {
private B[] b;
}
class B { }

正解: F

質問 10

What is the role of a JSP author?

A. to write Java code that interacts with server-side objects

B. to write Java code to implement business logic

C. to coordinate the interaction between all the pages in a complex dynamic web-based application

D. to put static data and dynamic content together to create dynamic web pages

正解: D

質問 11

Given:
5 . // insert code here
6 . public void eat();
7 . }
8 .
9 . // insert code here
1 0. public void eat() {
1 1. System.out.println("eating dinner");
1 2. }
1 3. }
Which, inserted at lines 5 and 9, allows the file to compile?

A. 5. interface Animal {
9 . public class Tiger extends Animal {

B. 5. class Animal {
9 . public class Tiger subclasses Animal {

C. 5. class Animal {
9 . public class Tiger extends Animal {

D. 5. interface Animal {
9 . public class Tiger subclasses Animal {

E. 5. interface Animal {
9 . public class Tiger implements Animal {

F. 5. class Animal {
9 . public class Tiger implements Animal {

正解: E

質問 12

Which three are legal ways to declare and initialize an instance variable? (Choose three.)

A. public int x = 'c';

B. public Integer f = new Integer(42);

C. public Integer f = null;

D. static Integer f = new Integer(42);

E. public int x = null;

F. static int x = 42;

正解: A,B,C

質問 13

Which two classes make valid use of the ArrayList class in package java.util? (Choose two.)

A. import java.util.ArrayList;
public class Test {
public static void main(String args[]) {
ArrayList list = new ArrayList();
}

B. package java.util;
public class Test {
public static void main(String args[]) {
ArrayList list = new ArrayList();
}

C. import java.util;
public class Test {
public static void main(String args[]) {
ArrayList list = new ArrayList();
}

D. public class Test import java.util.ArrayList {
public static void main(String args[]) {
ArrayList list = new ArrayList();
}

E. package java.util.ArrayList;
public class Test {
public static void main(String args[]) {
ArrayList list = new ArrayList();
}

F. public class Test {
public static void main(String args[]) {
java.util.ArrayList list = new java.util.ArrayList();
}

正解: A,F

質問 14

Given:
1 . abstract class A {}
2 . class B {}
3 . interface C {}
4 . interface D {}
5 . // insert code here
Which, inserted at line 5, results in a compilation failure?

A. class E extends A {}

B. class E extends B implements D {}

C. class E implements C {}

D. class E implements C, D {}

E. class E extends A, B {}

F. interface E extends C, D {}

正解: E

質問 15

Which four are primitive integer types in Java? (Choose four.)

A. nibble

B. short

C. double

D. byte

E. float

F. int

G. long

正解: B,D,F,G

Oracle Java Standard Edition 5 and 6, Certified Associate - 1Z0-850 模擬練習