Method declaration in Java - Step-by-Step Execution

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Concept Flow - Method declaration

Start

↓

Write method signature

↓

Add method body with statements

↓

Method ready to be called

↓

End

This flow shows how a method is declared: first write the signature, then add the body, and finally the method is ready to use.

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Execution Sample

Java

public int add(int a, int b) {
    return a + b;
}

This code declares a method named add that takes two numbers and returns their sum.

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Execution Table

Step	Action	Evaluation	Result
1	Declare method 'add' with parameters a=3, b=5	Method signature accepted	Method ready
2	Execute method body: return a + b	Calculate 3 + 5	8 returned
3	Method call completes	Return value 8	Output = 8

💡 Method execution ends after returning the sum of a and b

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Variable Tracker

Variable	Start	During Execution	Final
a	undefined	3	3
b	undefined	5	5
return value	undefined	8	8

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Key Moments - 3 Insights

▶Why do we need to specify the return type before the method name?

▶What happens if we forget to write 'return' inside the method?

▶Can the method parameters change during execution?

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Visual Quiz - 3 Questions

Look at the execution_table, what is the return value at step 2?

A 3

B 8

C 5

D undefined

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Concept Snapshot

Method declaration syntax:
[access_modifier] [return_type] methodName([parameters]) {
    // method body
}
- Return type tells what value method sends back
- Parameters are inputs to method
- Method body contains code to run
- Use 'return' to send back a value

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Full Transcript

This visual trace shows how a method is declared in Java. First, the method signature is written with access modifier, return type, name, and parameters. Then the method body contains statements, here a return statement adding two numbers. The execution table traces declaring the method, running the body, and returning the result. Variables a and b hold input values, and the return value is the sum. Key points include the need for return type and return statement. The quizzes check understanding of return values, method readiness, and effects of changing return type.