[英]Java Print Value Object on Map<String, Object>
I set list on another class我在另一个班级设置了列表
List<DataModel> dataList = new ArrayList<DataModel>();
parsed on class在课堂上解析
for(DataModel list : dataList) {
final String[] data = {list.getVar_a(), list.getVar_b()};
System.out.println("out data");
System.out.println(list.getVar_a());
System.out.println(list.getVar_b());
}
this prints data这打印数据
out data
val_a
val_b
Model Class模型类
class DataModel {
private String var_a, var_b;
//Getter & Setter
}
But now, I use and set map on another class and I'm not implementing a model class because in real case it has too many variables.但是现在,我在另一个类上使用并设置了 map 并且我没有实现模型类,因为在实际情况下它有太多变量。
Map<String, Object> mapData = new LinkedHashMap<String, Object>();
when I set data on map, its result from database当我在地图上设置数据时,它的结果来自数据库
Map<String, Object> map = new LinkedHashMap<String, Object>();
msg = (String) cs.getObject(5);
rs = (ResultSet) cs.getObject(4);
ResultSetMetaData rsmd = rs.getMetaData();
int count = rsmd.getColumnCount();
if(rs.next()){
int jml = 0;
do {
Map<String, Object> data = new LinkedHashMap<>();
for (int i = 1; i <= count; i++ ) {
String name = rsmd.getColumnName(i);
data.put(name, rs.getObject(name));
}
map.put(""+jml, data);
jml++;
} while(rs.next());
setStatus(SUCCESS);
setMessage(msg);
} else {
LOG.info(NO_DATA_FOUND);
}
parsed on class在课堂上解析
for(Map.Entry<String,Object> list : mapData.entrySet()) {
String key = list.getKey();
Object val = list.getValue();
System.out.println("out data");
System.out.println(key);
System.out.println(val);
}
this prints data这打印数据
out data
0
{var_a=val_a, var_b=val_b}
I want to get value on object like this我想在这样的对象上获得价值
out data
val_a
val_b
Change your Map for loop to:将您的 Map for 循环更改为:
for(Map.Entry<String,Object> list : mapData.entrySet()) {
DataModel value = (DataModel) list.getValue();
System.out.println("out data");
System.out.println(value.getVar_a());
System.out.println(value.getVar_b());
}
First you have a map of object, and what you really need is a Map of Map.首先你有一个对象地图,你真正需要的是一个地图地图。
Here is your reading a map of object.这是您阅读的对象地图。
for(Map.Entry<String,Object> list : mapData.entrySet()) {
String key = list.getKey();
Object val = list.getValue();
System.out.println("out data");
System.out.println(key);
System.out.println(val);
}
What you really need is a map of map as I am showing below.您真正需要的是我在下面显示的地图。
Map<String, Map<String, Object>> map = new LinkedHashMap<String, Map<String, Object>>()
Now if you read it as map of map, You can have the result that you need.现在,如果您将其阅读为地图地图,则可以获得所需的结果。
0
: {a1:v1, a2:v2, etc...}, 1
: {a2:v2, a2:v2, etc...}, 2
: {a3:v3, a3:v3, etc...} 0
: {a1:v1, a2:v2, etc...}, 1
: {a2:v2, a2:v2, etc...}, 2
: {a3:v3, a3:v3, etc...}
for(Map.Entry<String,Map<String, Object> list : mapData.entrySet()) {
String key = list.getKey();
System.out.println("out data");
for(Map.Entry<String,Object> innermap : list.getValue().entrySet()) {
//System.out.println(innermap.getKey());
System.out.println(innermap.getValue());
}
}
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