Java Programming Fundamentals

The terminology is: the overridden method is in the PARENT class (the original version being replaced), and the overriding method is in the CHILD class (the new version). The statement reverses this correctly, so False is the right answer. You're overriding the parent's method from the child.

You CAN override a non-abstract method as abstract in a subclass. This makes the subclass abstract and forces subclasses of it to provide an implementation. It's a valid technique when you want to require subclasses to reimplement a method, even if the parent provided a concrete version.

You cannot reduce visibility when overriding - private is more restrictive than public. Java's overriding rules require the subclass method to have at least the same access level as the parent. Changing public void doIt() to private void doIt() violates this, so the code is illegal.

Java is neither purely interpreted nor purely compiled - it's a hybrid language. Java source code is compiled to bytecode, which is then either interpreted by the JVM or JIT-compiled to native code at runtime. 'Byte Code Language' is not a standard programming language classification.

The main method must be static so the JVM can invoke it without creating an instance of the class (no object exists at program startup). It must be public so the JVM, which is external to your class, can access it. Static methods belong to the class itself, not instances, and public allows unrestricted access from outside.

Valid main method signatures must be public static void with a single String array or varargs parameter. Modifier order (static public vs public static) is flexible. Parameter names can be any valid identifier. Return type must be void, and only one String array/varargs parameter is allowed.

In Java, checked exceptions are subclasses of Exception but are not subclasses of RuntimeException. Subclasses of Error and RuntimeException are unchecked.

The expression evaluates as: pre-decrement --i changes i from 5 to 4, then 4/2.0 gives 2.0 (double division because 2.0 is double), and the unary + keeps it as 2.0. Note: The assignment 'int a = 2.0' would cause a compilation error due to type mismatch; the question focuses on the expression value.

Line 1 fails because a double literal (4.5) cannot be implicitly assigned to a float without an 'f' suffix. Line 4 fails because a short cannot be implicitly assigned to a char due to range differences.

In Java, the '+' operator evaluates from left to right. Since the first operand is a String, the subsequent numbers 5 and 3 are concatenated as strings, resulting in 'Sum of 5 and 3 is:53'.

In Systems Hungarian Notation, 'l' prefix indicates a long integer. The variable name 'lAccountNum' follows this convention by using the 'l' prefix to denote type information, even though Systems Hungarian encodes semantic type rather than raw storage type.

In Simonyi's Hungarian notation (Apps Hungarian), 'w' prefix denotes a word (16-bit value). 'b' is for byte, 'f' for boolean/flag, and 'sz' for null-terminated strings. This is a standard naming convention prefix.

In Hungarian notation, 'f' prefix indicates a boolean flag or boolean value. Floating-point would use 'd' (double) or 'f' only if differentiating float types. The 'Busy' suffix further suggests this is a true/false state.

In Hungarian notation: 'a' = array, 'u' = unsigned, 'l' = long. So 'aulColors' decodes to 'array of unsigned long'. This is standard Hungarian prefix composition for complex types.

This does NOT follow Hungarian notation convention. Hungarian notation uses lowercase prefixes like 'g_' for global, not 'g_'. Also, 'n' for number is correct but the prefix placement violates the standard format which should be 'gnWheels' or similar.

All variables declared in a Java interface are implicitly public, static, and final. They become compile-time constants that must be initialized and cannot be modified. This is a fundamental Java language rule for interfaces.

In Java, all interface members are implicitly public. Conversely, an abstract class can declare members with any access modifier, including private and protected.

Abstract classes in Java CAN have constructors. While they cannot be instantiated directly, their constructors are called when a subclass is instantiated using super(). This allows initialization of inherited fields and setup logic.

Classes IMPLEMENT interfaces, not extend them. Option B claims classes extend interfaces, which is false - you use 'implements' keyword for interfaces. Classes extend other classes, and interfaces extend other interfaces.

Java allows marker interfaces - interfaces with no methods. They are used to mark classes for special treatment by the JVM or compiler (e.g., Serializable, Cloneable). An empty interface declaration is syntactically valid and serves this purpose.