A touch screen is classified as a special type of scanning device.
Answer the following statement true (T) or false (F)
False
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Which of the following statements is false?
a. You must create an object of class JOptionPane to use its static method showMessageDialog. b. JOptionPane method showInputDialog displays an input dialog containing a prompt and a field (known as a text field) in which a user can enter text. c. String method format works like method System.out.printf, except that format returns the formatted String rather than displaying it in a command window. d. An input dialog allows the user to enter data into a program.
The Unix command rm only deletes a file only when
A. the system runs out of free blocks B. the last link is removed
Which of the following statements is true?
Consider the classes below: ``` public class TestA { public static void main(String[] args) { int x = 2; int y = 20 int counter = 0; for (int j = y % x; j < 100; j += (y / x)) { counter++; } } } public class TestB { public static void main(String[] args) { int counter = 0; for (int j = 10; j > 0; --j) { ++counter; } } } ``` a. The value of counter will be different at the end of each for loop for each class. b. The value of j will be the same for each loop for all iterations c. Both (a) and (b) are true. d. Neither (a) nor (b) is true.
Analyze the following code:
``` public class Test { public static void main(String args[]) { NClass nc = new NClass(); nc.t = nc.t++; } } class NClass { int t; private NClass() { } } ``` a. The program has a compile error because the NClass class has a private constructor. b. The program does not compile because the parameter list of the main method is wrong. c. The program compiles, but has a runtime error because t has no initial value. d. The program compiles and runs fine.