可以在Jena中替换Model中所有语句的主题吗？

// 导入所需的包
import org.apache.jena.rdf.model.*;

public class ReplaceSubjectExample {
    public static void main(String[] args) {
        // 创建一个空的Model
        Model model = ModelFactory.createDefaultModel();

        // 添加一些语句到Model中
        Resource subject1 = model.createResource("http://example.org/subject1");
        Property predicate = model.createProperty("http://example.org/predicate");
        RDFNode object = model.createLiteral("Object 1");
        model.add(subject1, predicate, object);

        Resource subject2 = model.createResource("http://example.org/subject2");
        object = model.createLiteral("Object 2");
        model.add(subject2, predicate, object);

        // 获取Model中的所有语句
        StmtIterator iter = model.listStatements();

        // 遍历并替换语句的主题
        while (iter.hasNext()) {
            Statement stmt = iter.nextStatement();
            Resource oldSubject = stmt.getSubject();
            Resource newSubject = model.createResource("http://example.org/newSubject");
            Statement newStmt = stmt.changeSubject(newSubject);

            // 更新Model
            model.remove(stmt);
            model.add(newStmt);
        }

        // 打印替换后的Model
        model.write(System.out, "TURTLE");
    }
}