CC104- PRELIM LAB EXAM

Local variables are typically declared and initialized within which specific programming constructs?

• Inside methods, constructors, or defined within specific blocks of code.

• Outside any methods, constructors, or blocks, at the class level.

• With a special 'static' keyword, existing as a single copy per class.

• As primitive data types that store the actual values directly in memory.

When are instance variables initialized, holding values specific to an object's individual state?

• When the program begins execution, before any objects are ever created.

• Only once, when their containing class is first loaded into memory.

• Upon the creation of an object using the 'new' keyword.

• Immediately before any method within the class begins its execution.

What keyword is required when declaring a variable within a class to make it a class variable?

• private

• public

• final

• static

Which primitive data type in Java is specifically designed for tracking simple true or false conditions?

• char, capable of storing a single 16-bit Unicode character eRiciently.

• byte, used to save space in large arrays, four times smaller than int.

• boolean, representing a single bit of information for logical states.

• short, another memory-saving type, two times smaller than an integer.

Which primitive data type consumes the smallest amount of memory, representing a single bit?

• byte, typically using 1 byte to store integral values in an array.

• boolean, which tracks true/false conditions and represents only one bit.

• short, utilized for memory savings, being two times smaller than an int.

• char, storing a single 16-bit Unicode character, taking 2 bytes.

Which of the following options represents a reference type, storing memory addresses for data locations?

• A variable declared as 'int' holding an integer numerical value.

• A 'boolean' variable representing a simple true or false logical state.

• An 'array' of integers, pointing to a memory location containing elements.

• A 'char' variable containing a single 16-bit Unicode character value.

Which control structure allows testing a new condition when the preceding 'if' condition evaluates as false?

• The 'switch' statement, which evaluates an expression against multiple cases.

• The 'else if' statement, providing an alternative conditional block to execute.

• A 'default' case, which executes if no other conditions are met previously.

• The 'ternary operator', oRering a concise way to evaluate true/false outcomes.

What keyword within a Java 'switch' statement immediately terminates execution after a case match occurs?

• The 'continue' keyword, which skips the current iteration and proceeds.

• The 'return' keyword, which exits the method containing the switch block.

• The 'break' keyword, stopping further execution within the switch block.

• The 'default' keyword, specifying code to run if no case matches are found.

What is a key characteristic that distinguishes a 'do-while' loop from a standard 'while' loop?

• The 'do-while' loop ensures its statements execute at least once before checking the condition.

• A 'while' loop always executes its body at least once, regardless of the condition.

• The 'do-while' loop checks its condition at the beginning, making it entry-controlled.

• A 'while' loop is primarily used for iterating through elements in an array collection.

Which part of a Java 'for' loop is responsible for modifying the control variable's value each iteration?

• The initializing statement, setting up the loop's starting control variable value.

• The expression, which defines the condition for the loop's continued execution.

• The increment/decrement part, altering the control variable's value over iterations.

• The loop body, containing the statements that are repeatedly executed during the process.