Oracle 1Z0-851 問題集

質問 1：
DRAG DROP
Click the Task button.

正解：


質問 2：
DRAG DROP
Click the Task button.

正解：


質問 3：
DRAG DROP
Click the Task button.

正解：


質問 4：
Given:
2.public class Hi {
3.void m1() { }
4.protected void() m2 { }
5.}
6.class Lois extends Hi {
7.// insert code here
8.}
Which four code fragments, inserted independently at line 7, will compile? (Choose four.)
A. protected void m1() { }
B. protected void m2() { }
C. private void m1() { }
D. public void m1() { }
E. private void m2() { }
F. public void m2() { }
G. void m2() { }
正解：A,B,D,F

質問 5：
Given:
1.public class TestOne {
2.public static void main (String[] args) throws Exception {
3.Thread.sleep(3000);
4.System.out.println("sleep");
5.}
6.}
What is the result?
A. The code executes normally and prints "sleep".
B. An exception is thrown at runtime.
C. Compilation fails.
D. The code executes normally, but nothing is printed.
正解：A

質問 6：
Given:
11.public static void main(String[] args) {
12.String str = "null";
13.if (str == null) {
14.System.out.println("null");
15.} else (str.length() == 0) {
16.System.out.println("zero");
17.} else {
18.System.out.println("some");
19.}
20.}
What is the result?
A. null
B. some
C. An exception is thrown at runtime.
D. Compilation fails.
E. zero
正解：D

質問 7：
Given:
12.import java.util.*;
13.public class Explorer3 {
14.public static void main(String[] args) {
15.TreeSet<Integer> s = new TreeSet<Integer>();
16.TreeSet<Integer> subs = new TreeSet<Integer>();
17.for(int i = 606; i < 613; i++)
18.if(i%2 == 0) s.add(i);
19.subs = (TreeSet)s.subSet(608, true, 611, true);
20.subs.add(629);
21.System.out.println(s + " " + subs);
22.}
23.}
What is the result?
A. [608, 610, 612, 629] [608, 610, 629]
B. [606, 608, 610, 612, 629] [608, 610, 629]
C. An exception is thrown at runtime.
D. Compilation fails.
E. [606, 608, 610, 612, 629] [608, 610]
F. [608, 610, 612, 629] [608, 610]
正解：B

質問 8：
Given:
1.public class Mule {
2.public static void main(String[] args) {
3.boolean assert = true;
4.if(assert) {
5.System.out.println("assert is true");
6.}
7.}
8.}
Which command-line invocations will compile?
A. javac -source 1.3 Mule.java
B. javac -source 1.4 Mule.java
C. javac -source 1.5 Mule.java
D. javac Mule.java
正解：A