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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.LiteralTree;
import com.sun.source.tree.Tree;
import java.util.Collection;
import java.util.Collections;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;

/**
 * A node for a float literal. For example:
 *
 *  *   8.0f
 *   6.022137e+23F
 * 
 */
public class FloatLiteralNode extends ValueLiteralNode {

  /**
   * Create a new FloatLiteralNode.
   *
   * @param t the tree for the literal value
   */
  public FloatLiteralNode(LiteralTree t) {
    super(t);
    assert t.getKind() == Tree.Kind.FLOAT_LITERAL;
  }

  @Override
  public Float getValue() {
    return (Float) tree.getValue();
  }

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

  @Override
  public boolean equals(@Nullable Object obj) {
    // test that obj is a FloatLiteralNode
    if (!(obj instanceof FloatLiteralNode)) {
      return false;
    }
    // super method compares values
    return super.equals(obj);
  }

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