java - 从 Map 获取键值对

Question

我有这段代码来检索 map 的键值对:

countries = BeneficiaryJSONParser.parseCountriesFeed(result);
for(Map.Entry<String, Object> entry: countries.entrySet()) {
    System.out.println(entry.getKey() + " : " + entry.getValue());
}

输出:

data : [{234=United Arab Emirates, 103=India, 210=Sri Lanka, 235=United Kingdom, 216=Switzerland, 200=Singapore, 76=France}]
status : 200
code : 1

我想获取包含键和值的数组形式的数据。因为，我想将那些键值对放入，

final MyData items[] = new MyData[3];
items[0] = new MyData( "234","United Arab Emirates" );
items[1] = new MyData( "103","India" );
items[2] = new MyData( "210","Sri Lanka" );
.
.
. 

Answer 1

您只需将每个条目转换为 MyData:

List<MyData> data = new ArrayList<> ();
for (Map.Entry<String, Object> e: countries.entrySet()) {
  data.add(new MyData(e.getKey(), String.valueOf(e.getValue());
}

final MyData[] items = data.toArray(new MyData[0]);

或者使用流:

final MyData[] items = countries.entrySet().stream()
                        .map(e -> new MyData(e.getKey(), String.valueOf(e.getValue()))
                        .toArray(MyData[]::new);