What does statement "abc: {..}" mean? [duplicate]

Question

I have never come across such expression in Java. It is not even a switch case

 //no code above to make it look like a switch case or loop

 abc: {
    // do some stuff
      break abc;
 }

Do you have any idea what this does?

Answer 1

They are labels, see http://docs.oracle.com/javase/tutorial/java/nutsandbolts/branch.html for a complete explanation.