Nested if statements in Java - Step-by-Step Execution

Concept Flow - Nested if statements

Start

↓

Check if condition1

|Yes↓

Check if condition2

|Yes↓

Execute inner if block

↓

Else inner if block

↓

Continue after nested if

↓

Else outer if block

↓

End

First, the outer condition is checked. If true, the inner condition is checked next. Depending on inner condition, different blocks run. If outer condition is false, the else block runs.

Execution Sample

Java

int x = 10;
if (x > 5) {
  if (x < 15) {
    System.out.println("x is between 6 and 14");
  }
}

Checks if x is greater than 5, then if x is less than 15, prints a message.

Execution Table

Step	Condition Checked	Condition Result	Branch Taken	Output
1	x > 5	true	Enter outer if
2	x < 15	true	Enter inner if	x is between 6 and 14
3	End of nested if	-	Exit nested if

💡 All conditions checked, nested if blocks executed accordingly.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
x	10	10	10	10

Key Moments - 2 Insights

Why does the inner if only run when the outer if is true?

Because the inner if is inside the outer if block, it only executes if the outer condition is true, as shown in execution_table step 1 and 2.

What happens if the outer if condition is false?

The inner if is skipped entirely, and the program moves to the else block or continues after the nested if, as implied by the concept_flow.

Visual Quiz - 3 Questions

Look at the execution_table, what is the result of the condition 'x > 5' at step 1?

A undefined

B false

C true

D null

💡 Hint

Check the 'Condition Result' column in execution_table row 1.

At which step does the program print 'x is between 6 and 14'?

A Step 1

B Step 2

C Step 3

D No output

💡 Hint

Look at the 'Output' column in execution_table row 2.

If x was 4, what would happen to the execution flow?

A Outer if is false, inner if skipped

B Inner if runs

C Both ifs run

D Program crashes

💡 Hint

Refer to concept_flow and key_moments about outer if controlling inner if execution.

Concept Snapshot

Nested if statements check one condition inside another.
Syntax: if (condition1) { if (condition2) { ... } }
Inner if runs only if outer if is true.
Use to test multiple related conditions step-by-step.

Full Transcript

This example shows nested if statements in Java. First, the program checks if x is greater than 5. If yes, it then checks if x is less than 15. If both are true, it prints a message. The inner if only runs when the outer if condition is true. If the outer condition is false, the inner if is skipped. This helps test multiple conditions in order.