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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 com.sun.source.tree.Tree;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * 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 Tree 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
  public Collection getOperands() {
    return Collections.singletonList(expression);
  }
}