TCO 1: What Is The Name Of The Values The Method Call Passes

1 Tco 1 What Is The Name Of The Values The Method Call Passes To T

Below are the core questions and solutions related to Java programming concepts, particularly focusing on method parameters, class names, dialogs, control structures, loops, logical operators, static method calls, method overloading, and method definitions within classes.

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Understanding method parameters in Java is fundamental for effective programming. When a method is called, the values passed to it are known as "arguments". Arguments are the actual data or references provided to parameters in a method invocation, enabling the method to process specific values during execution (Oracle, 2020). It is essential to distinguish arguments from parameters; parameters are variables defined in method signatures, while arguments are the actual values supplied during calls.

For naming conventions in Java, fully qualified names include the complete package hierarchy followed by the class name, separated by dots. Among the options, java.util.Scanner correctly specifies the fully qualified name of the Scanner class in the util package, whereas Scanner java.Scanner is invalid syntax, and java.Scanner lacks the package prefix (Sun Microsystems, 2005).

Java provides several classes for GUI dialog boxes. The JOptionPane class is specifically used for simple dialogs, including message dialogs, input dialogs, and confirm dialogs. It simplifies displaying windows containing messages (Oracle, 2020). Unlike JDialogBox or JPrebuiltDialog, which are not standard Java classes, and JMessageDialog (which is not part of standard Swing components), JOptionPane is the correct choice for message dialogs.

Clarifying a dangling-else problem in Java often involves structured formatting using indentation, braces, parentheses, and comments. Indentation and braces are most effective for clarifying control flow, especially to distinguish which else blocks correspond to which if statements. Comments can also clarify code, but do not affect control structure. Relying solely on parentheses might be insufficient if braces are omitted, leading to potential ambiguity (Bloch, 2008).

In nested control structures, the placement and type of statements matter. It is valid to nest a while inside another while, as well as nesting if statements within while or if. Therefore, the statement that is false is the assertion that a while cannot be nested inside an if, which is incorrect.

Regarding loop iterations, different for loop control headers can produce equivalent numbers of iterations. The first loop counts from 1 to 100, executing 100 iterations. The second counts from 100 down to 0, also 101 iterations, but if considering the range inclusively, it’s equivalent. The third loop decrements by 9 from 99 down to above 0, producing approximately 11 iterations. The fourth decrements by 90 from 990 down to above 0, about 11 iterations. Loops I and II are similar in iteration count; III and IV are also similar. Consequently, the pairings are I and II, and III and IV.

The Boolean logical inclusive OR operator | evaluates both operands regardless of the first's result, making it useful when side effects or function calls in both conditions are needed. The conditional OR || short-circuits evaluation when the first operand is true, skipping the second. The | operator is appropriate when both conditions must be evaluated for side effects, such as function calls with side effects.

The Math.sqrt method is a static method, called directly from the class. The correct syntax is Math.sqrt(900). The other options, such as sqrt(900) or math.sqrt(900), are invalid without proper class reference or object instantiation.

Method overloading in Java occurs when multiple methods have the same name but different parameter lists. Based on the options, the methods max(int, int) and max(double, double) are overloaded, as well as max(int, int, int) and max(double, double, double). They differ by parameter type or number, allowing the compiler to choose the correct method version based on arguments.

Within a class, multiple methods named foo can be defined with different parameter types or counts. All the listed signatures are valid method definitions. Thus, the class can have: foo(int a), foo(int a, int b), foo(double a), foo(double a, double b), and foo(int b).

References

  • Bloch, J. (2008). Effective Java. Addison-Wesley.
  • Oracle. (2020). The Java™ Tutorials: Essential Classes. Oracle Corporation.
  • Sun Microsystems. (2005). Java Platform Standard Edition API Specification. Sun Microsystems.

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