Question

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What is a scan: block in Java?

I was browsing through some of the Java standard library code and I found the toUpperCase method in String.java (java.lang.String – JDK 1.6.0_32 x64). I’ve removed the irrelevant parts of the code in the snippet below.

The part that confused me was the scan: { ... } syntax. I am under the impression that lambda expressions aren’t a part of SE 6 or 7. Can somebody please enlighten me?

// String.java - line 2547 onwards.
public String toUpperCase(Locale locale) {
    // Do stuff.

    /* Now check if there are any characters that need to be changed. */
    scan: {
        // Do stuff.
    }

    // Do more stuff.
}

Answer 1

scan: { ... }

Its a Labeled Statements. usually labels are used in case of nested loop where you can either break or continue the loop.

Eg:

outer:while(cond) {
in:while(cond){
   break outer;
}
}