Final Exam in Java

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Final Exam
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1 An applet must be run using a browser or the appletviewer A Java application can be run from the command line using the Java Virtual Machine 2 Probably not An applet is restricted in what it can do on the local machine However, the local environment governs those restrictions Many local environments protect the local file system from an applet
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3 No An applet must be run from either a browser or the appletviewer 4 The entry point into an applet is the browser It is from there that the methods defined in the applet are called 5 init(), start(), and paint() 6 init() 7 The start() method contains statements that are executed each time the applet is started 8 Yes 9 You run an applet by using the applet tag in an HTML document 10 No, because an applet cannot be run from a command line A parameter can be passed to an applet from an HTML document 11 You call the setVisible() method and pass it a Boolean true 12 Radio button, check boxes, combo boxes, and other GUI elements that use a list of items from which the user makes a selection 13 Yes 14 GUI elements are added to the content pane The content pane is then placed in the container of the window 15 False A GUI element should be enabled only if it is used in the current process 16 You call the getContentPane() method 17 You call the setBackground() method and pass it a constant that corresponds to the color you want to use 18 No You cannot use pixel coordinates because they are machine specific, and their position may differ in various machines Java is a machine-independent language; therefore, you must use relative coordinates rather than explicit coordinates to position GUI elements in a window 19 The Gridbag Layout Manager enables you to specify the cell of the grid where a GUI element is to be positioned The Grid Layout Manager places GUI elements in the next available cell in the grid 20 In many programming languages, you can specify the exact location of each GUI element on the screen In Java, you specify the relative position, and the Java Virtual Machine determines the exact placement of the GUI element 21 An access specifier determines what parts of your program have access to members of a class
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22 An interface is a predefined set of methods that a class must define in order to implement the interface The interface tells a programmer that he/she must define a specific set of methods in a class in order to use (implement) the interface 23 True 24 You can cause a class to inherit another class by using the keyword extends in the class header 25 An abstract class is a class that cannot be instantiated 26 Overloading is a technique of creating two or more versions of the same method, where the name of the method remains the same but the method signature is different in each version 27 A method signature consists of the method name and an argument list 28 Encapsulation refers to combining related data and methods into a class and protecting the data from other parts of the program 29 The main() method is the entry point into every Java application 30 The Java Virtual Machine is a machine-dependent executable program capable of translating Java bytecode into machine-readable instructions 31 A Java application can run on any computer that has a Java Virtual Machine because the Java application s bytecode is machine independent and is interpreted by the Java Virtual Machine, which is machine specific 32 A resultset is data returned to a Java application from a DBMS in response to an SQL query sent by the application 33 An embedded query is an SQL query that is part of a program such as your Java program 34 A DBMS is a database management system used to store, retrieve, and maintain large amounts of data, and it can follow instructions written in SQL 35 Statements within a while loop may never be executed if the while loop condition expression is false Statements within a dowhile loop, however, always executes at least once, even if the while loop condition expression is false 36 An int is a data type used for whole numbers A float is a data type used for mixed numbers 37 System is the name of the System class 38 The new operator reserves memory for an object and returns a reference to that object and invokes a constructor method if one exists for the object
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