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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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import org.checkerframework.checker.propkey.qual.*;

package java.util;

class Properties {
  String getProperty(@PropertyKey String key);
  String getProperty(@PropertyKey String key, String defaultValue);
  Object setProperty(@PropertyKey String key, String value);
}

class ResourceBundle {
  Object getObject(@PropertyKey String key);
  String getString(@PropertyKey String key);
  String[] getStringArray(@PropertyKey String key);
  Set<@PropertyKey String> keySet();
}