If–else statement in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of an if–else statement in Java?

An if–else statement lets the program choose between two paths: one if a condition is true, and another if it is false.

beginner

Write the basic syntax of an if–else statement in Java.

if (condition) {<br> // code if true<br>} else {<br> // code if false<br>}

beginner

What happens if the condition in an if statement is false and there is no else block?

The program skips the if block and continues with the next code after it, doing nothing inside the if block.

intermediate

Can you have multiple else if blocks in Java? What is their purpose?

Yes, multiple else if blocks let you check several conditions in order, running the code for the first true condition.

beginner

Explain with an example how if–else helps in decision making in programs.

Example: if (score >= 50) {<br> System.out.println("Pass");<br>} else {<br> System.out.println("Fail");<br>}<br>This decides if a student passes or fails based on score.

What will happen if the condition in an if statement is true?

A Nothing happens

B The code inside the if block runs

C The program stops

D The code inside the else block runs

If the condition is true, the code inside the if block executes.

Which keyword is used to check an additional condition after an if in Java?

A elif

B elseif

C else

D else if

Java uses 'else if' (two words) to check another condition after an if.

What is the output of this code?<br>int x = 10;<br>if (x > 5) {<br> System.out.println("Yes");<br>} else {<br> System.out.println("No");<br>}

A Error

B No

C Yes

D Nothing

Since 10 is greater than 5, the if block runs and prints 'Yes'.

What happens if no else block is provided and the if condition is false?

A The program skips the if block and continues

B The if block runs anyway

C The program crashes

D The else block runs

Without else, if the condition is false, the program skips the if block and continues.

Which of these is a correct if–else statement in Java?

A if (x > 5) { System.out.println("Hi"); } else { System.out.println("Bye"); }

B if x > 5 then { print("Hi"); } else { print("Bye"); }

C if (x > 5) print("Hi"); else print("Bye");

D if x > 5 { System.out.println("Hi"); } else { System.out.println("Bye"); }

Java requires parentheses around the condition and braces for blocks.

Explain how an if–else statement controls the flow of a Java program.

Think about how the program chooses which code to run.

Write a simple Java if–else statement that prints 'Adult' if age is 18 or more, otherwise prints 'Minor'.

Use comparison and print statements.