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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.ThrowTree;

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

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

import javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;

/**
 * A node for exception throws:
 *
 *  *   throw expr
 * 
 */
public class ThrowNode extends Node {

    protected final ThrowTree tree;
    protected final Node expression;

    public ThrowNode(ThrowTree tree, Node expression, Types types) {
        super(types.getNoType(TypeKind.NONE));
        this.tree = tree;
        this.expression = expression;
    }

    public Node getExpression() {
        return expression;
    }

    @Override
    public ThrowTree getTree() {
        return tree;
    }

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

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

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

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

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