# Operators in Java

Contents

**What are the Operators?**

Programs perform various tasks through the instructions given to them. These commands or instructions contain various symbols that denote specific functions. These symbols are called **Operators**. Let us learn about * Operators in Java* in this article!

Operators are specific symbols that specify various mathematical or logical instructions used to manipulate the data in a program.

To learn about the operators from video tutorials, refer to this video:

**Types of Operators in Java:**

Java supports many operators just like C and C++. Operators are divided into 3 categories depending upon the number of operands they work on.

**Unary Operator**- It operates on only 1 operand
- For example: ++, –, !, ~

**Binary Operators**- It operates on 2 operands
- For example: &&, %, /, ||

**Conditional/Ternary Operator**- It operates on 3 operands

These unary and binary operators perform different functions. And based on these functions, the operators can be further classified into 6 categories. They are:

- Arithmetic Operators
- Relational Operators
- Logical Operators
- Bitwise Operators
- Assignment Operators
- Special Operators

**Arithmetic Operators:**

- Performs manipulations like simple mathematical addition, subtraction, multiplication
- Assume A and B are 2 integer variables holding values:
- A = 10
- B = 5

Operator | Function | Example |
---|---|---|

+ (Addition Operator) | Adds the two operands | A + B --> 15 |

- (Subtraction Operator) | Subtracts second operand from the first operand | A – B --> 5 |

* (Multiplication Operator) | Multiplies both the operands | A * B --> 50 |

/ (Division Operator) | Divides numerator by denominator | A / B --> 2 |

% (Modulus Operator) | Gives the remainder after an integer division | A % B --> 0 |

++ (Increment operator) | increases integer value by one | A++ --> 11 |

-- (Decrement operator) | decreases integer value by one | B-- --> 4 |

Below is a simple program to display arithmetic operators and their functions.

package mypackage; public class ArithmaticOperators { static int A = 10; static int B = 5; public static void main(String[] args) { System.out.println("Arithmatic Operators !! \n"); // "\n" creates an empty line System.out.println("Addition Operator : " +"A + B = " + (A + B)); System.out.println("Subtraction Operator : " +"A - B = " + (A - B)); System.out.println("Subtraction Operator : " +"B - A = " + (B - A)); System.out.println("Multiplication Operator : " +"A * B = " + (A * B)); System.out.println("Division Operator : " +"A / B = " + (A / B)); System.out.println("Modulus Operator : " +"A % B = " + (A % B)); A++ ; //A is incremented to 11 System.out.println("Value of A after increment : "+ A); B--; System.out.println("Value of B after increment : "+ B); } }

Output:

**Relational Operators:**

- These are used to comparing two data values or two quantities.
- They are also called as
**Comparison**operators. - It returns a
**boolean value**based upon the condition. If the condition is satisfied, the result is true, else the result is false. - Assume A and B are 2 integer variables holding values as
- A = 10
- B = 5

Operator | Function | Example |
---|---|---|

== (Is equal to) | Checks if the values of two operands are equal or not. If yes, then the condition becomes true | (A == B) is false |

!= (Is not equal to) | Checks if the values of two operands are equal or not. If the values are not equal, then the condition becomes true | (A != B) is true |

> (Greater than) | Checks if the value of left operand is greater than the value of right operand. If yes, then the condition becomes true | (A > B) is false |

< (Less than) | Checks if the value of left operand is less than the value of right operand. If yes, then the condition becomes true | (A < B) is true |

>= (Greater than or equal to) | Checks if the value of left operand is greater than or equal to the value of right operand. If yes, then the condition becomes true | (A >= B) is false |

<= (Less than or equal to) | Checks if the value of left operand is less than or equal to the value of right operand. If yes, then the condition becomes true | (A <= B) is true |

The program shows the use of relational operators.

package mypackage; public class RelationalOperators { static int A = 10; static int B = 5; public static void main(String[] args) { System.out.println("Relational Operators !! \n"); // "\n" creates an empty line System.out.println("Is equal to Operator : " +"A == B --> " + (A == B)); System.out.println("Is not equal to Operator : " +"A != B --> " + (A != B)); System.out.println("Greater than Operator : " +"A > B --> " + (A > B)); System.out.println("Less than Operator : " +"A < B --> " + (A * B)); System.out.println("Greater than or equal to Operator : " +"A >= B --> " + (A >= B)); System.out.println("Less than or equal to Operator : " +"A <= B --> " + (A <= B)); } }

Output:

**Logical Operators:**

- These help to checks
**multiple conditions**. - The result depends upon the
**validity**of the individual conditions as well as the validity of the combined statement. - They return a
**boolean value i.e. true or false.** - Assume A and B are 2 integer variables with values
- A = 10
- B = 5.

Let us define 3 conditions:

- Con1:
- (
*A*>*B*) is true.

- (
- Con2:
- (
*A*==*B*) is false.

- (
- Con3:
- (
*A*/*B*== 2) is true.

- (

Operator | Function | Example |
---|---|---|

&& (Logical AND operator) | If both the operands are non-zero or true, then condition becomes true. | Con1 && Con2 gives false |

|| (Logical OR Operator) | If any of the two operands is nonzero or true, then condition becomes true. | Con1 || Con2 gives true |

! (Logical NOT Operator) | It reverses the logical state of its operand. If a condition is true, then Logical NOT operator will make false and vice-versa. | !Con1 gives false |

The below program displays the use of logical operators.

package mypackage; public class LogicalOperators { static int A = 10; static int B = 5; public static void main(String[] args) { Boolean Condition1 = (A > B); Boolean Condition2 = (A == B); Boolean Condition3 = (A / B == 2); System.out.println("Condition 1 is "+ Condition1); System.out.println("Condition 2 is "+ Condition2); System.out.println("Condition 3 is "+ Condition3+"\n"); System.out.println("Logical Operators !! \n"); // "\n" creates an empty line System.out.println("Logical AND Operator : (Condition1 && Condition2) " + (Condition1 && Condition2)); System.out.println("Logical AND Operator : (Condition1 && Condition3) " + (Condition1 && Condition3)); System.out.println("Logical OR Operator : (Condition1 || Condition2) " + (Condition1 || Condition2)); System.out.println("Logical NOT Operator (Condition 1) : " + (!Condition1)); System.out.println("Logical NOT Operator (Condition 2 : " + (!Condition2)); } }

Output

**Bitwise Operators:**

- It performs operations on individual bits of a number.
- It works bit-by-bit to give the result.
- The truth tables for & (AND), | (OR), and ^ (XOR) are as follows:

p | q | p & q | p | q | p ^ q |
---|---|---|---|---|

0 | 0 | 0 | 0 | 0 |

0 | 1 | 0 | 1 | 1 |

1 | 0 | 0 | 1 | 1 |

1 | 1 | 1 | 1 | 0 |

- Assume if
- A = 7;
- B = 3;

- In binary format
- A = 0111
- B = 0011

**Bitwise AND**- It returns bit by bit AND operation of the operands
- A&B = 0011, In decimal A&B = 3

**Bitwise OR**- This operator performs OR operation bit by bit on the operands.
- A|B = 0111, In decimal A|B = 7

**Bitwise XOR**- Returns bit by bit XOR operation of the operands.
- If both the bits are same, gives 0 else gives 1.
- A^B = 0100, In decimal A^B = 4

**Bitwise NOT**- Inverses each bit of the input operand.
- It converts each 0 to 1 and each 1 to 0.
- ~A = 1000, In decimal ~A = 8

**Binary Left Shift Operator**- The left operand’s bits are moved left by the number of bits specified by the right operand.
- It multiplies the operand by 2^n.
- The power n is equal to the number of bits specified by the right operand.

- A = 0111, In decimal A= 7
- A << 1 = 1110, In decimal A << 1 = 14

**Binary Right Shift****Operator**- The left operand’s bits are moved right by the number of bits specified by the right operand.
- It divides the operand by 2^n.
- The power n is equal to the number of bits specified by the right operand.

- A = 0111, In decimal A= 7
- A >> 1 = 0011, In decimal A >> 1 = 3

**Assignment Operators**

- Assignment operators assign the result of an expression to a variable.
- It is a binary operator.
- The value of the right operand is assigned to the left operand.

Operator | Function | Example |
---|---|---|

= (Assign) | Assigns values from right side operands to left side operand | K = 3 A = B |

+= (Increments, then assigns) | It adds the right operand to the left operand and assigns the result to the left operand | C += A means C = C+A |

-= (Decrements, then assigns) | It subtracts the right operand from the left operand and assigns the result to the left operand | C -= A means C = C-A |

*= (Multiplies, then assigns) | It multiplies the right operand with the left operand and assigns the result to the left operand | C *= A means C = C*A |

/= (Divides, then assigns) | It divides the left operand with the right operand and assigns the result to the left operand | C /= A means C = C/A |

%= (Modulus, then assigns) | It takes modulus using two operands and assigns the result to the left operand | C %= A means C = C%A |

**Ternary Operator (Conditional Operator):**

- It works on 3 operands
- It consists of 2 parts:
`Condition ? Expression1 : Expression2`

- If
**Condition**is true then it returns value of**Expression1**otherwise returns the value of**Expression2**

The program below displays the use of the conditional operator:

package mypackage; public class TernaryOperator { static int A = 10; static int B = 6; public static void main(String[] args) { int result1; int result2; result1 = (A / B == 2) ? (A - B) : (A + B); System.out.println("Result 1 is : "+result1); result2 = (A / B != 2) ? (A - B) : (A + B); System.out.println("Result 2 is : "+result2); } }

Output:

**Special Operators:**

Java also supports some special type of operators like:

- Dot Operator
- InstanceOf Operator

**Dot Operator (.):**

- Dot operator helps to access:
- variable/constant
- method
- Class
- package
- For Example:
`java.lang.System.out.println("Hello");`

**The instanceof Operator:**

- This operator checks the existence of an object and returns a
**boolean**value. - It is also called a
**type/object comparison operator.**- it compares if the object belongs to the specified type.

- Applying the instanceof operator with any object having a null value, returns false.
- It can also identify objects of derived and inherited classes.

The below program explains the use of the instanceof operator.

package mypackage; public class CheckInstance { public static void main(String[] args) { CheckInstance ob = new CheckInstance(); CheckInstance object = null; System.out.println("ob instanceof CheckInstance :"+(ob instanceof CheckInstance)); System.out.println("object instanceof CheckInstance"+(object instanceof CheckInstance)); } }

Output:

In the next article, I will discuss looping control in Java. The article will cover different loops available in Java and how to use them.