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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.dataflow.cfg.node;

import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.Tree;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;

import java.util.Collection;
import java.util.Collections;

/**
 * A node for a character literal. For example:
 *
 *  *   'a'
 *   '\t'
 *   '\u03a9'
 * 
 */
public class CharacterLiteralNode extends ValueLiteralNode {

    /**
     * Create a new CharacterLiteralNode.
     *
     * @param t the character literal
     */
    public CharacterLiteralNode(LiteralTree t) {
        super(t);
        assert t.getKind() == Tree.Kind.CHAR_LITERAL;
    }

    @Override
    public Character getValue() {
        return (Character) tree.getValue();
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitCharacterLiteral(this, p);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        // test that obj is a CharacterLiteralNode
        if (!(obj instanceof CharacterLiteralNode)) {
            return false;
        }
        // super method compares values
        return super.equals(obj);
    }

    @Override
    @SideEffectFree
    public Collection getOperands() {
        return Collections.emptyList();
    }
}