HarmonyOS 关于从HashMap里查找数据的问题

目前由于对象不支持重写hashCode值，无法通过对象key值进行准确Map里的value数据。建议转换为string作为key，参考示例如下：

export class TestMap {
  message: string;

  constructor(msg: string) {
    this.message = msg;
  }
}

export function Test() {
  let test1 = new TestMap("test");
  let test2 = new TestMap("test");
  let test1Json = JSON.stringify(test1) as string
  let test2Json = JSON.stringify(test2) as string
  let testMap = new Map<string, TestMap>();
  testMap.set(test1Json, test1);
  testMap.set(test2Json, test2);
  console.log(`testMap size=${testMap.size}`);
  console.log(`test1Json=${test1Json}`);
  console.log(`test2Json=${test2Json}`);
}