Labeled break and continue in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a labeled break in Java?

A labeled break allows you to exit a specific outer loop or block by using a label name before the break statement. It helps to break out of nested loops directly.

beginner

How does a labeled continue differ from a regular continue?

A labeled continue skips the current iteration of the specified outer loop, not just the innermost loop. It uses a label to identify which loop to continue.

intermediate

Example of labeled break usage:<br>

outer: for (int i = 0; i < 3; i++) {
  for (int j = 0; j < 3; j++) {
    if (i == j) break outer;
  }
}

<br>What happens when i equals j?

When i equals j, the labeled break 'break outer;' exits the outer loop completely, stopping all iterations of both loops.

beginner

Can you use labeled break or continue without nested loops?

Yes, but it is uncommon. Labeled break or continue is mainly useful for nested loops to control outer loops. Without nested loops, a label is unnecessary.

beginner

What is the syntax to define a label in Java?

A label is an identifier followed by a colon before a loop or block, for example:<br>

labelName: for (int i = 0; i < 5; i++) { ... }

What does a labeled break do in nested loops?

A Restarts the entire program

B Exits the specified outer loop immediately

C Skips the current iteration of the innermost loop

D Does nothing special

A labeled break exits the loop identified by the label, which can be an outer loop in nested loops.

How do you write a label in Java?

A continue labelName;

B for (labelName) { ... }

C break labelName;

D labelName: for (...) { ... }

A label is an identifier followed by a colon placed before a loop or block.

What happens when you use labeled continue inside nested loops?

A Skips to the next iteration of the labeled outer loop

B Exits all loops immediately

C Skips the current iteration of the innermost loop only

D Causes a syntax error

Labeled continue skips the current iteration of the loop identified by the label.

Is it necessary to use labels with break or continue in single loops?

A Only for continue, not break

B Yes, always required

C No, labels are mainly for nested loops

D Only for break, not continue

Labels are useful mainly when you want to control outer loops in nested loops.

Which keyword is used to skip the current iteration of a loop?

A continue

B break

C exit

D skip

The continue keyword skips the current iteration and moves to the next iteration of the loop.

Explain how labeled break works in nested loops and give a simple example.

Think about how to stop multiple loops at once.

Describe the difference between labeled continue and regular continue in Java loops.

Focus on which loop is affected by the continue statement.