Java HashMap 内容到字符串
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Java HashMap content to String
提问by CeZet
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I want convert content of HashMapto Stringas converting ArrayListto Stringusing Arrays.toString(arrayList).
我想将HashMapto 的内容String转换ArrayList为Stringusing Arrays.toString(arrayList)。
Is it possible ? There is easy way to do this?
是否可以 ？有没有简单的方法可以做到这一点？
Do I must have to iteration and appending it using Iterator? As example:
我是否必须迭代并使用它附加它Iterator？例如：
HashMap<String, ArrayList<MyObject>> objectMap = new HashMap<String, ArrayList<>>();
//.... put many items to objectMap
Iterator it = objectMap.entrySet().iterator();
while(it.hasNext()){
Map.Entry pairs = (Map.Entry) it.next();
System.out.println(pairs.getKey() + " = " + pairs.getValue());
}
I think that it is different because of pair <String, ArrayList>not <String, Integer>
我认为这是不同的，因为pair <String, ArrayList>not<String, Integer>
回答by Bahramdun Adil
You can use toString()of the Map:
您可以使用toString()的Map：
String content = objectMap.toString();
Mapoverrides the toString()method, so you can easily get the contents of map.
Map覆盖该toString()方法，因此您可以轻松获取地图的内容。
I should give an example:
我应该举个例子：
public static void main(String[] args) throws Exception {
HashMap<String, List<MyObject>> objectMap = new HashMap<>();
List<MyObject> list = new ArrayList<>();
list.add(new MyObject(12, 12));
objectMap.put("aaaa", list);
String content = objectMap.toString();
System.out.println("content = " + content);
}
private static class MyObject {
int min;
int max;
public MyObject(int max, int min) {
this.max = max;
this.min = min;
}
@Override
public String toString() {
return "MyObject{" +
"max=" + max +
", min=" + min +
'}';
}
}
And it is the output:
这是输出：
content = {aaaa=[MyObject{max=12, min=12}]}
So it means it works well
所以这意味着它运作良好
