Java: Composite key in hashmaps

Question

I would like to store a group of objects in a hashmap , where the key shall be a composite of two string values. is there a way to achieve this?

i can simply concate

Answer 1

You don't need to reinvent the wheel. Simply use the Guava's HashBasedTable implementation of Table interface, for your need. Here is an example

Table table = HashBasedTable.create();

table.put("key-1", "lock-1", 50);
table.put("lock-1", "key-1", 100);

System.out.println(table.get("key-1", "lock-1")); //prints 50
System.out.println(table.get("lock-1", "key-1")); //prints 100

table.put("key-1", "lock-1", 150); //replaces 50 with 150

Happy coding!