Return values in Java - Step-by-Step Execution

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Concept Flow - Return values

Start method

↓

Execute statements

↓

Return value reached?

No→Continue execution

Yes↓

Return value sent back

↓

Method ends

The method runs its code until it hits a return statement, then sends the value back and stops.

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Execution Sample

Java

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

This method adds two numbers and returns their sum.

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Execution Table

Step	Action	Variables	Return?	Output
1	Method add called with a=3, b=4	a=3, b=4	No
2	Calculate sum = a + b	a=3, b=4, sum=7	No
3	Return sum	a=3, b=4, sum=7	Yes	7
4	Method ends		No

💡 Return statement reached at step 3, method returns 7 and ends.

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Variable Tracker

Variable	Start	After Step 2	Final
a	3	3	3
b	4	4	4
sum	undefined	7	7

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Key Moments - 2 Insights

▶Why does the method stop running after the return statement?

▶Can code after the return statement run?

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Visual Quiz - 3 Questions

Look at the execution table, what is the value of 'sum' when the return happens?

A 7

B 3

C 4

D undefined

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Concept Snapshot

Return values in Java methods:
- Use 'return' to send a value back.
- Method stops running after return.
- Returned value matches method's declared type.
- Code after return is not executed.
- Returned value can be stored or used by caller.

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Full Transcript

In Java, a method can send a value back to where it was called using a return statement. When the method runs, it executes its code line by line. Once it reaches the return statement, it sends the specified value back and stops running immediately. For example, in the add method, it calculates the sum of two numbers and returns it. The variable sum holds the result before returning. After return, the method ends, so no further code runs. This behavior helps methods give results to other parts of the program.