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Questions and Answers
What is the primary purpose of conditional statements in a program?
What is the primary purpose of conditional statements in a program?
- To perform arithmetic operations
- To iterate over a collection of data
- To take action based on a given condition (correct)
- To handle errors and exceptions
What is the function of the Equals method in Java?
What is the function of the Equals method in Java?
- To compare memory addresses of two variables
- To handle null pointer exceptions
- To compare the contents of two strings (correct)
- To perform arithmetic operations on two variables
What is the difference between an IF statement and an IF-ELSE statement?
What is the difference between an IF statement and an IF-ELSE statement?
- An IF statement handles multiple conditional expressions, while an IF-ELSE statement handles one
- An IF statement has no else clause, while an IF-ELSE statement has an else clause (correct)
- An IF statement has two conditional expressions, while an IF-ELSE statement has one
- An IF statement is used for arithmetic operations, while an IF-ELSE statement is used for string comparisons
What is the function of the NOT logical operator in Java?
What is the function of the NOT logical operator in Java?
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What is the purpose of relational operators in Java?
What is the purpose of relational operators in Java?
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What is a characteristic of nested conditional statements in Java?
What is a characteristic of nested conditional statements in Java?
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Study Notes
Conditional Statements
- Allow a program to take action based on a given condition
- Typically compare two values to decide what action to take
Relational Operators
- Label: Equals • Symbol: == • Syntax: x == y
- Label: NOT Equals • Symbol: != • Syntax: x != y
- Label: Less Than • Symbol: < • Syntax: x < y
- (and more relational operators...)
IF Statements
- Handle one conditional expression
- Syntax: if (condition) { //do something here }
- The program does something if the condition is true; otherwise, it does nothing
IF-ELSE Statements
- Handle two conditional expressions
- Syntax: if (condition) { //do something here } else { //do something here }
- The program does the first code block if the condition is true; otherwise, it does the second code block
IF-ELSE IF-ELSE Statements
- A conditional statement within a conditional statement
- Nested conditional statements can be any type of conditional statement
Nested Conditional Statements
- Syntax: if (condition) { if (condition) { //do something here } }
- Can be any type of conditional statement
EQUALS Function
- Used to compare strings more efficiently
- Necessary because equal relational operators compare memory addresses, not content
Logical Operators
- Label: AND • Symbol: && • Syntax: condition && condition • Description: Both conditions need to be true
- Label: OR • Symbol: || • Syntax: condition || condition • Description: Either condition needs to be true
- Label: NOT • Symbol: ! • Syntax: !condition • Description: Negates the condition
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