import org.apache.tinkerpop.gremlin.structure.Graph.Features; //导入依赖的package包/类
@Override
public Features.VariableFeatures variables() {
    return variablesFeatures;
}
 

import org.apache.tinkerpop.gremlin.structure.Graph.Features; //导入依赖的package包/类
@Override
public Features.VertexPropertyFeatures properties() {
    return vertexPropertyFeatures;
}
 

import org.apache.tinkerpop.gremlin.structure.Graph.Features; //导入依赖的package包/类
/**
 * Gets the {@link Features} exposed by the underlying {@code Graph} implementation.
 *
 * @return a features object
 * @see org.apache.tinkerpop.gremlin.structure.Graph#features()
 */
public Features features() {
    return graph.features();
}