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Java Tutorial » Statement Control » Statement  
4.1.4.Label a statement blockPrevious/Next
  1. A statement and a statement block can be labeled.
  2. Label names follow the same rule as Java identifiers and are terminated with a colon.
public class MainClass {

  public static void main(String[] args) {
    int x = 0, y = 0;
    sectionA: x = y + 1;
  }

}

And, here is an example of labeling a block:

public class MainClass {

  public static void main(String[] args) {
    start: {
      // statements
    }
  }

}

Label statement can be referenced by the break and continue statements.

4.1.Statement
4.1.1. An Overview of Java Statements
4.1.2. Expressions
4.1.3. Declaring and defining multiple variables in a single statement
4.1.4. Label a statement block
4.1.5. Spreading a single declaration over several lines
4.1.6. How to write multiple assignments in a single statement
4.1.7. Combining both statements into one
4.1.8. Statement Blocks