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Oracle Java Certified Programmer Sample Questions:

1. What writes the text "<end>" to the end of the file "file.txt"?

A) OutputStream os= new FileOutputStream ("file.txt", true);
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");
B) OutputStream os= new FileOutputStream ("file.txt");
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");
C) OutputStream out= new FileOutputStream ("file.txt");
Out.writeBytes ("<end>/n");
D) OutputStream os= new OutputStream ("file.txt", true);
DataOutputStream out = new DataOutputStream(os); out.writeBytes ("<end>/n");

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

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

3. Given:
1 .public class ForBar {
2 .public static void main(String []args){
3 .int i = 0, j = 5;
4 .tp: for (;;){
5 .i ++;
6 .for(;;)
7 .if(i > --j) break tp;
8 .}
9 .system.out.printIn("i = " + i + ", j = "+ j);
1 0.}
1 1.}
What is the result?

A) The program runs and prints "i=3, j=0"
B) An error at line 7 causes compilation to fail.
C) The program runs and prints "i=1, j=0"
D) The program runs and prints "i=3, j=4"
E) The program runs and prints "i=1, j=4"
F) An error at line 4 causes compilation to fail.

4. Which code determines the int value foo closest to a double value bar?

A) Int foo = (int) Math.floor(bar);
B) Int foo = (int) Math.abs(bar);
C) Int foo = (int) Math.round(bar);
D) Int foo = (int) Math.ceil(bar);
E) Int foo = (int) Math.max(bar);
F) Int foo = (int) Math.min(bar);

5. 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) 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").
B) 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").
C) 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").
D) Errors at lines 7 and 8 cause compilation to fail.

Solutions: