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Questions and Answers
What is the result of the AND operation between 'true' and 'false'?
What is the result of the AND operation between 'true' and 'false'?
For the XOR operation, when does it return 'false'?
For the XOR operation, when does it return 'false'?
What is the result of applying the NOT operator twice (!!) on 'true'?
What is the result of applying the NOT operator twice (!!) on 'true'?
What is the perimeter of a rectangle with length 15 and breadth 27?
What is the perimeter of a rectangle with length 15 and breadth 27?
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In a rectangle with length 15 and breadth 27, what is the area?
In a rectangle with length 15 and breadth 27, what is the area?
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Which of the following is a unary operator in Java?
Which of the following is a unary operator in Java?
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What is the purpose of the modulo operator (%)?
What is the purpose of the modulo operator (%)?
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Which of the following is a ternary operator in Java?
Which of the following is a ternary operator in Java?
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What is the result of the expression 5 > 3 && 2 < 4?
What is the result of the expression 5 > 3 && 2 < 4?
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Which of the following relational operators checks for equality?
Which of the following relational operators checks for equality?
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What is the result of the expression !false?
What is the result of the expression !false?
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Study Notes
Binary Operators
- The binary operator AND (&) evaluates to true only when both operands have a true value.
- The binary operator OR (|) evaluates to true except when both operands are false.
- The binary operator XOR (^) returns true except when both operands have the same value.
Unary Operators
- The unary NOT (!) operator is complimentary, switching true to false and false to true.
Operators in Java
- Operators are symbols that carry out mathematical or logical functions on an operand or operands.
- Types of operators in Java:
- Unary Operators: have only one operand, e.g., bitwise complement (~), negation (-), increment (++) and decrement (--).
- Binary Operators: have exactly two operands, e.g., arithmetic, relational, and logical operators.
- Ternary Operators: have at most three operands, e.g., the conditional operator (?:).
Arithmetic Operators
- Operators: +, -, *, /, %, ++, --
- Descriptions:
- Addition: +
- Subtraction: -
- Multiplication: *
- Division: /
- Modulo: %
- Increment: ++
- Decrement: --
Relational Operators
- Operators: <, >=, ==, !=, >, <=
- Descriptions:
- Less than: <
- Less than or equal to: <=
- Greater than: >
- Greater than or equal to: >=
- Equal to: ==
- Not Equal to: !=
- Relational operators are binary operators that yield a true or false value.
Logical Operators
- Operators: !, &, |, &&, ||
- Descriptions:
- NOT: !
- AND: &
- OR: |
- Short-circuit AND: &&
- Short-circuit OR: ||
- Logical operators are governed by logical rules, and truth tables are necessary to evaluate logical operations.
Coding Exercises
- Calculate the area and perimeter of a rectangle with length 15 and breadth 27.
- Check if the two numbers 35 and 75 are equal.
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Description
Test your knowledge on Java operators which are symbols that perform mathematical or logical functions on operands. Learn about unary operators like bitwise complement, negation, increment, and decrement, binary operators with two operands, and ternary operators with at most three operands.
