What is the difference between a primary key and a secondary key?
What will be an ideal response?
A primary key is a key that uniquely identifies a record. A key is called a secondary key if it cannot uniquely identify a record. Secondary keys either may be unique or may identify multiple records in a database.
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A container is governed by a(n) __________________, which determines exactly how the components added to the panel will be displayed.
a) event b) content pane c) JFrame object d) JPanel object e) layout manager
Analyze the following code.
``` Number[] numberArray = new Integer[2]; numberArray[0] = new Double(1.5); ``` Which of the following statements is correct? a. You cannot use Number as a data type since it is an abstract class. b. Since each element of numberArray is of the Number type, you cannot assign an Integer object to it. c. Since each element of numberArray is of the Number type, you cannot assign a Double object to it. d. At runtime, new Integer[2] is assigned to numberArray. This makes each element of numberArray an Integer object. So you cannot assign a Double object to it.
Updating your operating software on a regular basis helps prevent system corruption from ______, which are malicious websites downloading harmful software to your computer
a. CAPTCHA b. pharming c. phishing d. drive-by-downloads
The cin object is used to enter data into a program while it is ____.
A. compiling B. running C. interpreting D. loading