🚀 Day 6 of My Automation Journey – Operators in Java

Source: Dev.to

What is an Operator?

An operator is a special symbol used to perform operations on variables and values.

• Operator → Symbol
• Operand → The value on which the operator acts

Example

int total = 10 + 5;

Assignment Operator (=)

Used to assign values to variables.

int tamil = 10;
int english = 2;

Arithmetic Operators

Used for mathematical calculations.

Example

System.out.println(tamil + english); // 12
System.out.println(tamil - english); // 8
System.out.println(tamil * english); // 20
System.out.println(tamil / english); // 5
System.out.println(tamil % english); // 0

Unary Operators

Unary operators work on a single variable.

Post Increment (age++)

Uses the value first, then increments.

Pre Increment (++age)

Increments first, then uses the value.

Example

int age = 10;

System.out.println(age++);  // 10
System.out.println(age);    // 11
System.out.println(--age);  // 10

Equality & Relational Operators

These operators compare two values.

## Trainer’s Complex Expression – Detailed Breakdown

```java
int a = 5;
int b = 7;
int c = 10;

int result = a++ + a-- - --a + --b - ++c - --c;

Initial Values

• a = 5
• b = 7
• c = 10

Step‑by‑Step Evaluation (Left to Right)

1. a++ → uses 5, then a becomes 6
2. a-- → uses 6, then a becomes 5
3. --a → a becomes 4, uses 4
4. --b → b becomes 6, uses 6
5. ++c → c becomes 11, uses 11
6. --c → c becomes 10, uses 10

Substituting the values:

result = 5 + 6 - 4 + 6 - 11 - 10

Calculation:

• 5 + 6 = 11
• 11 - 4 = 7
• 7 + 6 = 13
• 13 - 11 = 2
• 2 - 10 = -8

Final Output: -8

What I Learned on Day 6

• Complete understanding of Assignment, Arithmetic, Unary, Relational, and Logical operators.
• Clear difference between == (equality) and = (assignment).
• How Java evaluates pre‑ and post‑increment operations.
• Why complex unary expressions should be written carefully.

Day 6 strengthened my understanding of how Java handles values internally and how operators influence program behavior.

Date: 24/02/2026
Trainer: Nantha from Payilagam

A Small Note

I used ChatGPT to help me structure and refine this blog.