Java Operators
Turn values into expressions.
முக்கிய விளக்கங்கள் தமிழில் உள்ளன. Runnable example மற்றும் கூடுதல் practice notes ஆங்கிலத்தில் உள்ளன.
இந்தப் பாடத்தில்…
- Explain the key idea behind Operators.
- Read and run a complete example, then predict what changes.
- Recognize the topic-specific mistake discussed below.
அடிப்படையைப் புரிந்துகொள்ளுங்கள்
An expression combines values and operators to produce a result. The types of the operands matter: dividing two ints uses integer division, even if you assign the result to a double afterwards. Parentheses make your intended order explicit.
விரிவான விளக்கங்கள்
Java Operators என்னன்னு தெரியுமா?
Operators-ஐ use பண்ணி variables மற்றும் values-ல operations perform பண்ணலாம்.
Java-ல பல வகை operators இருக்கு:
- Arithmetic operators — கணக்கு பண்றதுக்கு (+, -, *, /, %, ++, –)
- Assignment operators — value assign பண்றதுக்கு (=, +=, -=, *=, /=)
- Comparison operators — values compare பண்றதுக்கு (==, !=, >, <, >=, <=)
- Logical operators — conditions combine பண்றதுக்கு (&&, ||, !)
- Bitwise operators — bit-level operations-க்கு
Arithmetic Operators
Common arithmetic operators:
| Operator | பெயர் | Example |
|---|---|---|
| + | Addition | x + y |
| – | Subtraction | x – y |
| * | Multiplication | x * y |
| / | Division | x / y |
| % | Modulus (மீதி) | x % y |
| ++ | Increment | ++x |
| — | Decrement | –x |
Compound Assignment Operators
| Operator | Example | Equivalent to | Meaning |
|---|---|---|---|
+= | x += 5 | x = x + 5 | Add and assign |
-= | x -= 3 | x = x - 3 | Subtract and assign |
*= | x *= 2 | x = x * 2 | Multiply and assign |
/= | x /= 4 | x = x / 4 | Divide and assign |
%= | x %= 3 | x = x % 3 | Modulus and assign |
Ternary Operator
int age = 20;
String status = (age >= 18) ? "Adult" : "Minor";
System.out.println(status); // Adult
int a = 10, b = 25;
int max = (a > b) ? a : b;
System.out.println("Max: " + max); // Max: 25Java-வில் `==` operator objects-க்கு என்ன compare செய்யும்?
- Object-ன் content-ஐ compare செய்யும்
- Memory address (reference)-ஐ compare செய்யும்
- Object size-ஐ compare செய்யும்
- Object type-ஐ compare செய்யும்
Reveal answer / விடை
Memory address (reference)-ஐ compare செய்யும்
Objects-க்கு `==` memory reference compare செய்யும். Content compare செய்ய `.equals()` method பயன்படுத்தவும். Interview-ல் இது மிக முக்கியமான question!
முழுமையான உதாரணம்
This complete Main.java program focuses on the lesson idea. Reference fragments above may demonstrate individual statements; this example includes the imports, entry point, and supporting types it needs.
public class Main {
public static void main(String[] args) throws Exception {
int total = 17;
int groupSize = 5;
System.out.println(total / groupSize);
System.out.println(total % groupSize);
System.out.println((double) total / groupSize);
}
}Predict first. Then reveal the expected output / வெளியீடு
3 2 3.4
The output shown was checked by running this complete example. Trace the executed statements in order, then compare with your run.
Change it. Run it. Understand it.
Load this lesson example into the editor. Change one value or statement, predict the result, then press RUN to execute Java.
Powered by OneCompiler. Code you run is sent to OneCompiler for execution. For Scanner examples, supply input in the editor I/O panel; for file examples, files exist in its execution environment.
நீங்களே முயற்சி செய்யுங்கள்
Practice challenge
Change total to 20 and predict the quotient and remainder.
Reveal the answer and reasoning / விடை
The integer quotient is 4, the remainder is 0, and the decimal division produces 4.0.
தவிர்க்க வேண்டிய தவறு: Use == for primitive equality checks, not =. Use equals when comparing String contents.
பாடத்தின் சுருக்கம்
- Explain the example without reading the output first.
- Make the change requested in the practice task.
- Describe why the result changed—or why compilation failed.
Ready to move on? Follow the next lesson in course order, or return to the curriculum to review a prerequisite.