Often we have to work with data structures like: Maps, Arrays,Sets...
And many times it is just more comfortable to initialize them dynamically.
In the following example i use double brace initialization technique to dynamically initialize a map that uses a constant as a key and a List as a value. When we want to initialize this types of structures in a dynamical way, this approach is probably the most comfortable and easy.
And many times it is just more comfortable to initialize them dynamically.
In the following example i use double brace initialization technique to dynamically initialize a map that uses a constant as a key and a List as a value. When we want to initialize this types of structures in a dynamical way, this approach is probably the most comfortable and easy.
1: new HashMap<ProductCategories, List<Products>>() {
2: {
3: put(ProductCategories.DAIRY_PRODUCTS,
4: new ArrayList<Products>() {
5: {
6: add(Products.CHEESE);
7: add(Products.SOUR_CREAM);
8: add(Products.YOGURTH);
9: }
10: }
11: );
12: put(ProductCategories.MEAT,
13: new ArrayList<Products>() {
14: {
15: add(Products.BEEF);
16: add(Products.CHICKEN);
17: add(Products.TURKEY);
18: }
19: }
20: );
21: put(ProductCategories.VEGETABLES,
22: new ArrayList<Products>() {
23: {
24: add(Products.TOMATO);
25: add(Products.ONION);
26: add(Products.CAGABE);
27: }
28: }
29: );
30: }
31: };
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