Oracle 1Z0-853 問題集

質問 1：
Given:
1.public class Threads5 {
2.public static void main (String[] args) {
3.new Thread(new Runnable() {
4.public void run() {
5.System.out.print("bar");
6.}}).start();
7.}
8.}
What is the result?
A. The code executes normally and prints "bar".
B. An exception is thrown at runtime.
C. Compilation fails.
D. The code executes normally, but nothing prints.
正解：A

質問 2：
Given:
84.
try {
85.
ResourceConnection con = resourceFactory.getConnection();
86.
Results r = con.query("GET INFO FROM CUSTOMER");
87.
info = r.getData();
88.
con.close();
89.
} catch (ResourceException re) {
90.
errorLog.write(re.getMessage());
91.
}
92.
return info;
Which statement is true if a ResourceException is thrown on line 86?
A. The resource connection will not be closed on line 88.
B. The connection will not be retrieved in line 85.
C. The enclosing method will throw an exception to its caller.
D. Line 92 will not execute.
正解：A

質問 3：
Given code in separate source files:
10.
public class Foo {
11.
public int a;
12.
public Foo() { a = 3; }
13.
public void addFive() { a += 5;}
14.
} and: 20. public class Bar extends Foo {
21.
public int a;
22.
public Bar() { a = 8; }
23.
public void addFive() { this.a += 5; }
24.
} invoked with:
30.
Foo foo = new Bar();
31.
foo.addFive();
32.
System.out.println("Value: " + foo.a);
What is the result?
A. Value: 8
B. The code runs with no output.
C. An exception is thrown at runtime.
D. Compilation fails.
E. Value: 13
F. Value: 3
正解：F

質問 4：
Given:
10.
public class SuperCalc {
11.
protected static int multiply(int a, int b) { return a * b;}
12.
} and:
20.
public class SubCalc extends SuperCalc{
21.
public static int multiply(int a, int b) {
22.
int c = super.multiply(a, b);
23.
return c;
24.
}
25.
} and:
30.
SubCalc sc = new SubCalc ();
31.
System.out.println(sc.multiply(3,4));
32.
System.out.println(SubCalc.multiply(2,2));
What is the result?
A. Compilation fails because of an error in line 22.
B. The code runs with no output.
C. An exception is thrown at runtime.
D. 12 4
E. Compilation fails because of an error in line 21.
F. Compilation fails because of an error in line 31.
正解：A

質問 5：
Click the Exhibit button.
Which three code fragments, added individually at line 29, produce the output 100? (Choose three.)

A. o.getY().setX( 100 );
B. i = new Inner(); i.setX( 100 ); o.setY( i );
C. i = new Inner(); i.setX( 100 );
D. n = 100;
E. i.setX( 100 );
F. o.setY( i ); i = new Inner(); i.setX( 100 );
正解：A,B,E

質問 6：
DRAG DROP
Click the Task button.

正解：