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Java Tutorial » Reflection » Class  
7.1.19.Determine whether the supplied string represents a well-formed fully-qualified Java classname.Previous/Next
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import java.text.CharacterIterator;
import java.text.StringCharacterIterator;


public class Utils {

  /**
   * Determine whether the supplied string represents a well-formed fully-qualified Java classname. This utility method enforces
   * no conventions (e.g., packages are all lowercase) nor checks whether the class is available on the classpath.
   
   @param classname
   @return true if the string is a fully-qualified class name
   */
  public static boolean isFullyQualifiedClassnameString classname ) {
      if (classname == nullreturn false;
      String[] parts = classname.split("[\\.]");
      if (parts.length == 0return false;
      for (String part : parts) {
          CharacterIterator iter = new StringCharacterIterator(part);
          // Check first character (there should at least be one character for each part) ...
          char c = iter.first();
          if (c == CharacterIterator.DONEreturn false;
          if (!Character.isJavaIdentifierStart(c&& !Character.isIdentifierIgnorable(c)) return false;
          c = iter.next();
          // Check the remaining characters, if there are any ...
          while (c != CharacterIterator.DONE) {
              if (!Character.isJavaIdentifierPart(c&& !Character.isIdentifierIgnorable(c)) return false;
              c = iter.next();
          }
      }
      return true;
  }

}
7.1.Class
7.1.1. Get class name for various object
7.1.2. Create new instance
7.1.3. Get Canonical Name for a class
7.1.4. Demonstrates the use of getDeclaringClass()
7.1.5. Demonstrates the use of instance comparisons
7.1.6. Demonstrates usage of various class information methods
7.1.7. Demonstrates how to get declaration information on a Class
7.1.8. Demonstrates Dynamic class type checking
7.1.9. Demonstrates how to set public field objects
7.1.10. Demonstrates fetching nested class info from a Class object
7.1.11. Demonstration of how to obtain instances of java.lang.Class
7.1.12. Demonstrates getting immediate superclass info
7.1.13. Get declared method by name and parameter type
7.1.14. get class from an object
7.1.15. Returns the name of a class without the package name
7.1.16. Class comparator: compare and sort classes and their superclasses.
7.1.17. Is Type Compatible
7.1.18. Is the Same Signature
7.1.19. Determine whether the supplied string represents a well-formed fully-qualified Java classname.