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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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package org.checkerframework.framework.util.defaults;

import org.checkerframework.framework.util.PluginUtil;

import java.util.Comparator;
import java.util.TreeSet;

/**
 * An ordered set of Defaults (see {@link org.checkerframework.framework.util.defaults.Default}).
 * This class provides a little syntactic sugar and a better toString over TreeSet.
 */
@SuppressWarnings("serial")
class DefaultSet extends TreeSet {

    private static final Comparator comparator =
        new Comparator() {
            @Override
            public int compare(Default d1, Default d2) {
                return d1.compareTo(d2);
            }
        };

    public DefaultSet() {
        super(comparator);
    }

    @Override
    public String toString() {
        return "DefaultSet( " + PluginUtil.join(", ", this) + " )";
    }

    public static final DefaultSet EMPTY = new DefaultSet();
}