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

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

import java.util.Objects;

/**
 * A node for the unary minus operation:
 *
 *  *   - expression
 * 
 */
public class NumericalMinusNode extends UnaryOperationNode {

    /**
     * Constructs a {@link NumericalMinusNode}.
     *
     * @param tree the unary tree
     * @param operand the operand of the unary minus
     */
    public NumericalMinusNode(UnaryTree tree, Node operand) {
        super(tree, operand);
        assert tree.getKind() == Tree.Kind.UNARY_MINUS;
    }

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

    @Override
    public String toString() {
        return "(- " + getOperand() + ")";
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (!(obj instanceof NumericalMinusNode)) {
            return false;
        }
        NumericalMinusNode other = (NumericalMinusNode) obj;
        return getOperand().equals(other.getOperand());
    }

    @Override
    public int hashCode() {
        return Objects.hash(NumericalMinusNode.class, getOperand());
    }
}