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JMockit is a Java toolkit for automated developer testing. It contains APIs for the creation of the objects to be tested, for mocking dependencies, and for faking external APIs; JUnit (4 & 5) and TestNG test runners are supported. It also contains an advanced code coverage tool.

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package mockit.asm.util;

import edu.umd.cs.findbugs.annotations.NonNull;

import org.checkerframework.checker.index.qual.NonNegative;

/**
 * A reference to a method.
 */
public final class MethodHandle {
    public interface Tag {
        int TAG_GETFIELD = 1;
        int TAG_GETSTATIC = 2;
        int TAG_PUTFIELD = 3;
        int TAG_PUTSTATIC = 4;
        int TAG_INVOKEVIRTUAL = 5;
        int TAG_INVOKESTATIC = 6;
        int TAG_INVOKESPECIAL = 7;
        int TAG_NEWINVOKESPECIAL = 8;
        int TAG_INVOKEINTERFACE = 9;
    }

    /**
     * The kind of method designated by this handle. Should be one of the {@link Tag Tag} constants.
     */
    @NonNegative
    public final int tag;

    /**
     * The internal name of the class that owns the method designated by this handle.
     */
    @NonNull
    public final String owner;

    /**
     * The name of the method designated by this handle.
     */
    @NonNull
    public final String name;

    /**
     * The descriptor of the method designated by this handle.
     */
    @NonNull
    public final String desc;

    /**
     * Initializes a new method handle.
     *
     * @param tag
     *            the kind of method designated by this handle. Must be one of the {@link Tag} constants.
     * @param owner
     *            the internal name of the class that owns the method designated by this handle.
     * @param name
     *            the name of the method designated by this handle.
     * @param desc
     *            the descriptor of the method designated by this handle.
     */
    public MethodHandle(@NonNegative int tag, @NonNull String owner, @NonNull String name, @NonNull String desc) {
        this.tag = tag;
        this.owner = owner;
        this.name = name;
        this.desc = desc;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }

        if (!(obj instanceof MethodHandle)) {
            return false;
        }

        MethodHandle h = (MethodHandle) obj;
        return tag == h.tag && owner.equals(h.owner) && name.equals(h.name) && desc.equals(h.desc);
    }

    @Override
    public int hashCode() {
        return tag + owner.hashCode() * name.hashCode() * desc.hashCode();
    }
}