如何通过java代码将java Map转换为不可变的Scala map？

import scala.collection.JavaConverters;
import scala.collection.immutable.Map;

import java.util.HashMap;
import java.util.Map;

public class JavaToScalaMap {
    public static void main(String[] args) {
        // 创建一个Java Map
        Map<String, Integer> javaMap = new HashMap<>();
        javaMap.put("key1", 1);
        javaMap.put("key2", 2);
        javaMap.put("key3", 3);

        // 将Java Map转换为Scala Map
        Map<String, Integer> scalaMap = JavaConverters.mapAsScalaMap(javaMap).toMap(
                scala.Predef.<scala.Tuple2<String, Integer>>conforms()
        );

        // 输出Scala Map
        System.out.println(scalaMap);
    }
}