Oracle Other Oracle Certification 1Z0-501

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Oracle Java Certified Programmer Sample Questions:

1. Given:
1 . public class SyncTest (
2 . private int x;
3 . private int y;
4 . private synchronized void setX (int i) (x=1;)
5 . private synchronized void setY (int i) (y=1;)
6 . public 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 return true when setXY is called by multiple threads.
B) Check() can only return true if SyncTest is changed to allow x and y to be set separately.
C) Check() can return true when multiple threads call setX and setY separately.
D) Check() can never return true.

2. Exhibit:
1 . public class X {
2 . public static void main (String[]args){
3 . int [] a = new int [1]
4 . modify(a);
5 . System.out.printIn(a[0]);
6 .}
7 .
8 . public static void modify (int[] a){
9 .a[0] ++;
1 0.}
1 1. }
What is the result?

A) The program runs and prints "0"
B) An error "possible undefined variable" at line 4 causes compilation to fail.
C) An error "possible undefined variable" at line 9 causes compilation to fail.
D) The program runs but aborts with an exception.
E) The program runs and prints "1"

3. Which constructs a DataOutputStream?

A) New dataInputStream("in.txt");
B) New dataInputStream(new FileInputStream("in.txt"));
C) New dataInputStream(new file("in.txt"));
D) New dataInputStream(new writer("in.txt"));
E) New dataInputStream(new FileWriter("in.txt"));
F) New dataInputStream(new InputStream("in.txt"));

4. Given:
1 . public class X {
2 . public static void main (String[] args){
3 . byte b = 127;
4 . byte c = 126;
5 . byte d = b + c;
6 .}
7 . }
Which statement is true?

A) The compilation succeeds and d takes the value of 1.
B) Line 5 throws an exception indicating "Out of range"
C) Line 5 contains an error that prevents compilation.
D) Line 3 and 4 contain error that prevent compilation.
E) Compilation succeeds and d takes the value 253.

5. CORRECT TEXT
Given:
3. string foo = "ABCDE";
4. foo.substring(3);
5. foo.concat("XYZ");
6. Type the value of foo at line 6.

Solutions:

Question # 1 Answer: A

Question # 2 Answer: E

Question # 3 Answer: B

Question # 4 Answer: C

Question # 5 Answer: Only visible for members