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

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

import java.util.Objects;

/**
 * A node for string concatenation:
 *
 *  *   expression + expression
 * 
 */
public class StringConcatenateNode extends BinaryOperationNode {

    /**
     * Constructs a {@link StringConcatenateNode}.
     *
     * @param tree the binary tree
     * @param left the left operand
     * @param right the right operand
     */
    public StringConcatenateNode(BinaryTree tree, Node left, Node right) {
        super(tree, left, right);
        assert tree.getKind() == Tree.Kind.PLUS;
    }

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

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

    @Override
    public boolean equals(@Nullable Object obj) {
        if (!(obj instanceof StringConcatenateNode)) {
            return false;
        }
        StringConcatenateNode other = (StringConcatenateNode) obj;
        return getLeftOperand().equals(other.getLeftOperand())
                && getRightOperand().equals(other.getRightOperand());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getLeftOperand(), getRightOperand());
    }
}