SUN CERTIFIED PROGRAMMER FOR THE JAVA 2 PLATFORM EXAM QUESTION AND ANSWER
QUESTION: 81
Given:
1.
public class TestOne implements Runnable {
2.
public static void main (String[] args) throws Exception {
3.
Thread t = new Thread(new TestOne());
4.
t.start();
5.
System.out.print("Started");
6.
t.join();
7.
System.out.print("Complete");
8.
}
9.
public void run() {
10.
for (int i = 0; i < 4; i++) {
11.
System.out.print(i);
12.
}
13.
}
14.
}
What
can be a result?
A.
Compilation fails.
B.
An exception is thrown at runtime.
C.
The code executes and prints "StartedComplete".
D.
The code executes and prints "StartedComplete0123".
E.
The code executes and prints "Started0123Complete".
Answer: E
QUESTION: 82
Which
three will compile and run without exception? (Choose three.)
A.
private synchronized Object o;
B.
void go() {
synchronized()
{ /* code here */ }
C.
public synchronized void go() { /* code here */ }
D.
private synchronized(this) void go() { /* code here */ }
E.
void go() {
synchronized(Object.class)
{ /* code here */ }
F.
void go() {
Object
o = new Object();
synchronized(o)
{ /* code here */ }
Answer: C,E,F
QUESTION: 83
Given:
1.
public class TestFive {
2.
private int x;
3.
public void foo() {
4.
int current = x;
5.
x = current + 1;
6.
}
7.
public void go() {
8.
for(int i = 0; i < 5; i++) {
9.
new Thread() {
10.
public void run() {
11.
foo();
12.
System.out.print(x + ", ");
13.
} }.start();
14.
} }
Which
two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?
(Choose two.)
A.
move the line 12 print statement into the foo() method
B.
change line 7 to public synchronized void go() {
C.
change the variable declaration on line 2 to private volatile int x;
D.
wrap the code inside the foo() method with a synchronized( this ) block
E.
wrap the for loop code inside the go() method with a synchronized block
synchronized(this)
{ // for loop code here }
Answer: A,D
QUESTION: 84
Given
that t1 is a reference to a live thread, which is true?
A.
The Thread.sleep() method can take t1 as an argument.
B.
The Object.notify() method can take t1 as an argument.
C.
The Thread.yield() method can take t1 as an argument.
D.
The Thread.setPriority() method can take t1 as an argument.
E.
The Object.notify() method arbitrarily chooses which thread to notify.
Answer: E
QUESTION: 85
Given:
11.
Runnable r = new Runnable() {
12.
public void run() {
13.
System.out.print("Cat");
14.
}
15.
};
16.
Thread t = new Thread(r) {
17.
public void run() {
18.
System.out.print("Dog");
19.
}
20.
};
21.
t.start();
What
is the result?
A.
Cat
B.
Dog
C.
Compilation fails.
D.
The code runs with no output.
E.
An exception is thrown at runtime.
Answer: B
QUESTION: 86
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.
Compilation fails.
B.
An exception is thrown at runtime.
C.
The code executes normally and prints "bar".
D.
The code executes normally, but nothing prints.
Answer: C
QUESTION: 87
Given:
10.
class One {
11.
void foo() { }
12.
}
13.
class Two extends One {
14.
//insert method here
15.
}
Which
three methods, inserted individually at line 14, will correctly complete class
Two?
(Choose
three.)
A.
int foo() { /* more code here */ }
B.
void foo() { /* more code here */ }
C.
public void foo() { /* more code here */ }
D.
private void foo() { /* more code here */ }
E.
protected void foo() { /* more code here */ }
Answer: B,C,E
QUESTION: 88
Given:
10.
abstract public class Employee {
11.
protected abstract double getSalesAmount();
12.
public double getCommision() {
13.
return getSalesAmount() * 0.15;
14.
}
15.
}
16.
class Sales extends Employee {
17.
// insert method here
18.
}
Which
two methods, inserted independently at line 17, correctly complete the Sales
class?
(Choose two.)
A.
double getSalesAmount() { return 1230.45; }
B.
public double getSalesAmount() { return 1230.45; }
C.
private double getSalesAmount() { return 1230.45; }
D.
protected double getSalesAmount() { return 1230.45; }
Answer: B,D
QUESTION: 89
Given:
1.
class X {
2.
X() { System.out.print(1); }
3.
X(int x) {
4.
this(); System.out.print(2);
5.
}
6.
}
7.
public class Y extends X {
8.
Y() { super(6); System.out.print(3); }
9.
Y(int y) {
10.
this(); System.out.println(4);
11.
}
12.
public static void main(String[] a) { new Y(5); }
13.
}
What
is the result?
A.
13
B.
134
C.
1234
D.
2134
E.
2143
F.
4321
Answer: C
QUESTION: 90
Given:
10.
package com.sun.scjp;
11.
public class Geodetics {
12.
public static final double DIAMETER = 12756.32; // kilometers
13.
}
Which
two correctly access the DIAMETER member of the Geodetics class? (Choose
two.)
A.
import com.sun.scjp.Geodetics;
public
class TerraCarta {
public
double halfway()
{
return Geodetics.DIAMETER/2.0; }
B.
import static com.sun.scjp.Geodetics;
public
class TerraCarta{
public
double halfway() { return DIAMETER/2.0; } }
C.
import static com.sun.scjp.Geodetics.*;
public
class TerraCarta {
public
double halfway() { return DIAMETER/2.0; } }
D.
package com.sun.scjp;
public
class TerraCarta {
public
double halfway() { return DIAMETER/2.0; } }
Answer: A,C
QUESTION: 91
Given:
1.
public class A {
2.
public void doit() {
3.
}
4.
public String doit() {
5.
return "a";
6.
}
7.
public double doit(int x) {
8.
return 1.0;
9.
}
10.
}
What
is the result?
A.
An exception is thrown at runtime.
B.
Compilation fails because of an error in line 7.
C.
Compilation fails because of an error in line 4.
D.
Compilation succeeds and no runtime errors with class A occur.
Answer: C
QUESTION: 92
Given:
35.
String #name = "Jane Doe";
36.
int $age = 24;
37.
Double _height = 123.5;
38.
double ~temp = 37.5;
Which
two statements are true? (Choose two.)
A.
Line 35 will not compile.
B.
Line 36 will not compile.
C.
Line 37 will not compile.
D.
Line 38 will not compile.
Answer: A,D
QUESTION: 93
Given:
10.
interface Foo { int bar(); }
11.
public class Sprite {
12.
public int fubar( Foo foo ) { return foo.bar(); }
13.
public void testFoo() {
14.
fubar(
15.
// insert code here
16.
);
17.
}
18.
}
Which
code, inserted at line 15, allows the class Sprite to compile?
A.
Foo { public int bar() { return 1; }
B.
new Foo { public int bar() { return 1; }
C.
new Foo() { public int bar() { return 1; }
D.
new class Foo { public int bar() { return 1; }
Answer: C
QUESTION: 94
Given:
11.
public enum Title {
12.
MR("Mr."), MRS("Mrs."), MS("Ms.");
13.
private final String title;
14.
private Title(String t) { title = t; }
15.
public String format(String last, String first) {
16.
return title + " " + first + " " + last;
17.
}
18.
}
19.
public static void main(String[] args) {
20.
System.out.println(Title.MR.format("Doe", "John"));
21.
}
What
is the result?
A.
Mr. John Doe
B.
An exception is thrown at runtime.
C.
Compilation fails because of an error in line 12.
D.
Compilation fails because of an error in line 15.
E.
Compilation fails because of an error in line 20.
Answer: A
QUESTION: 95
Given
the following six method names:
addListener
addMouseListener
setMouseListener
deleteMouseListener
removeMouseListener
registerMouseListener
How
many of these method names follow JavaBean Listener naming rules?
A.
1
B.
2
C.
3
D.
4
E.
5
Answer: B
QUESTION: 96
Given:
10.
class Line {
11.
public static class Point {}
12.
}
13.
14.
class Triangle {
15.
// insert code here
16.
}
Which
code, inserted at line 15, creates an instance of the Point class defined in
Line?
A.
Point p = new Point();
B.
Line.Point p = new Line.Point();
C.
The Point class cannot be instatiated at line 15.
D.
Line l = new Line() ; l.Point p = new l.Point();
Answer: B
QUESTION: 97
Given
11.
public interface Status {
12.
/* insert code here */ int MY_VALUE = 10;
13.
}
Which
three are valid on line 12? (Choose three.)
A.
final
B.
static
C.
native
D.
public
E.
private
F.
abstract
G.
protected
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