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Oracle 1Z0-501 Exam Syllabus Topics:

Oracle Java Certified Programmer Sample Questions:

1. Given:
1 3. public class Foo {
1 4. public static void main (String [] args){
1 5.StringBuffer a = new StringBuffer ("A");
1 6.StringBuffer b = new StringBuffer ("B");
1 7.operate (a,b);
1 8.system.out.printIn{a + "," +b};
1 9. )
2 0. static void operate (StringBuffer x, StringBuffer y){
2 1.y.append {x};
2 2.y = x;
2 3.)
2 4. }
What is the result?

A) The code compiles and prints "AB, AB".
B) The code compiles and prints "A,B".
C) The code does not compile because "+" cannot be overloaded for stringBuffer.
D) The code compiles and prints "BA, BA".
E) The code compiles and prints "AB, B".
F) The code compiles and prints "A, BA".

2. Given:
8 . int index = 1;
9 . boolean[] test = new Boolean[3];
1 0. boolean foo= test [index];
What is the result?

A) Foo has the value of false.
B) Foo has the value of null.
C) An exception is thrown.
D) Foo has the value of 0.
E) Foo has the value of true.
F) The code will not compile.

3. Which will declare a method that forces a subclass to implement it?

A) Static void methoda (double d1) {}
B) Abstract public void methoda();
C) Public native double methoda();
D) Public double methoda();
E) Protected void methoda (double d1){}

4. Exhibit:
1 . public class X implements Runnable(
2 . private int x;
3 . private int y;
4 .
5 . public static void main(String[]args)
6 . X that = new X();
7 .(new Thread(that)).start();
8 .(new Thread(that)).start();
9 .)
1 0.
1 1. public void run()(
1 2. for (;;)(
1 3. x++;
1 4. y++;
1 5. System.out.printIn("x=" + x + ", y = " + y);
1 6.)
1 7.)
1 8.)
What is the result?

A) Errors at lines 7 and 8 cause compilation to fail.
B) The program prints pairs of values for x and y that are always the same on the same line (for example, "x=1, y=1". In addition, each value appears only for once (for example, "x=1, y=1" followed by "x=2, y=2").
C) The program prints pairs of values for x and y that might not always be the same on the same line(for example, "x=2, y=1").
D) The program prints pairs of values for x and y that are always the same on the same line (forexample, "x=1, y=1". In addition, each value appears twice (for example, "x=1, y=1" followed by"x=1, y=1").

5. Given:
1 . public class SyncTest {
2 . private int x;
3 . private int y;
4 . public synchronized void setX (int i) (x=1;)
5 . public synchronized void setY (int i) (y=1;)
6 . public synchronized void setXY(int 1)(set X(i); setY(i);)
7 . public synchronized Boolean check() (return x !=y;)
8 . )
Under which conditions will check () return true when called from a different class?

A) Check() can never return true.
B) Check() can return true when multiple threads call setX and setY separately.
C) Check() can only return true if SyncTest is changed to allow x and y to be set separately.
D) Check() can return true when setXY is called by multiple threads.

Solutions: