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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 plus operation:
 *
 *  *   + expression
 * 
 */
public class NumericalPlusNode extends UnaryOperationNode {

    /**
     * Constructs a {@link NumericalPlusNode}.
     *
     * @param tree the tree of the whole operation
     * @param operand the operand of the operation
     */
    public NumericalPlusNode(UnaryTree tree, Node operand) {
        super(tree, operand);
        assert tree.getKind() == Tree.Kind.UNARY_PLUS;
    }

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

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

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

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