Solution 1
In you case you can do it with
Map<String, Object> props = new HashMap<String, Object>();
props.put("site-id", 0);
props.put("price-score", 0.5);
props.put("confidence-score", 0.2);
Map<String, String> category123 = new HashMap<String, String>();
category123.put("price_score", "0.5");
category123.put("confidence_score", "0.2");
Map<String, String> category321 = new HashMap<String, String>();
category123.put("price_score", "0.2");
category123.put("confidence_score", "0.4");
Map<String, Object> categories = new HashMap<String, Object>();
categories.put("123", category123);
categories.put("321", category321);
props.put("categories", categories);
Solution 2:
Or you can simplify it with additional classes, e.g.:
public class Category
{
private String price_score;
private String confidence_score;
public Category(String price_score, String confidence_score)
{
this.price_score = price_score;
this.confidence_score = confidence_score;
}
public Category()
{
}
// getters/setters
}
main method
Map<String, Object> props = new HashMap<String, Object>();
props.put("site-id", 0);
props.put("price-score", 0.5);
props.put("confidence-score", 0.2);
Map<String, Category> categories = new HashMap<String, Category>();
categories.put("123", new Category("0.4", "0.2"));
categories.put("321", new Category("0.2", "0.5"));
props.put("categories", categories);