Oracle 1Z0-501 real exam prep : Java Certified Programmer

Which two statements are true regarding the creation of a default constructor? (Choose Two)

• A. When a class has only constructors with parameters, the compiler does not create a defaultconstructor.
• B. The compiler always creates a default constructor for every class.
• C. The default constructor initializes method variables.
• D. The default constructor invokes the no-parameter constructor of the superclass.
• E. The default constructor initializes the instance variables declared in the class.

The file "file.txt" exists on the file system and contsins ASCII text.
Given:
3 8. try {
3 9. File f = new File("file.txt");
4 0. OutputStream out = new FileOutputStream(f, true);
4 1. }
4 2. catch (IOException){}
What is the result?

• A. The code runs and no change is made to the file.
• B. An exception is thrown because the file is not closed.
• C. The code does not compile.
• D. The code runs and deletes the file from the file system.
• E. The code runs and sets the length of the file to 0.

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

Which statements about static inner classes are true? (Choose Two)

• A. A static inner class requires an instance of the enclosing class.
• B. A static inner class requires a static initializer.
• C. Static members of a static inner class can be referenced using the class name of the static innerclass.
• D. A static inner class has no reference to an instance of the enclosing class.
• E. A static inner class has access to the non-static members of the outer class.

CORRECT TEXT
Exhibit:
1 . public class test {
2 . public static string output = ""
3 .
4 . public static void foo(int i) {
5 . try {
6 . if(i= =1) {
7 . throw new Exception ();
8 .}
9 . output += "1";
1 0. )
1 1. catch(Exception e) {
1 2. output += "2";
1 3. return;
1 4. )
1 5. finally (
1 6. output += "3";
1 7. )
1 8. output += "4";
1 9. )
2 0.
2 1. public static void main (string args[])(
2 2. foo(0);
2 3. foo(1);
2 4.
2 5.)
2 6. )
What is the value of the variable output at line 24?