Using table guava for hashbasedTable

Question

I am planning to use table guava for a 3D hash map implementation. I downloaded that and I am able to import the files. My requirement is the below

I have the below file in my hand and I just have to aggregate the file accordingly and that is shown in the next step.

A100|B100|3
A100|C100|2
A100|B100|5

The aggregation part would be below

A100|B100|8
A100|C100|2

I tried using the below

Table<String,String,Integer> twoDimensionalFileMap= new HashBasedTable<String,String,Integer>();

But this throws me an error, I just want to know two things

1. I just want to know, the arguments to be passed in the constructor of the HashBasedTable<String,String,Integer>()
2. How to initialize the row,column and the value for this table just like we do it for the map it is map.put(key,value) . In the similar sense could you guys tell me how to insert the values for this table?

Answer 1

Guava contributor here.

1. Don't use the constructor, use the HashBasedTable.create() factory method. (With no arguments, or with expectedRows and expectedCellsPerRow .)
2. Use table.put("A100", "B100", 5) , just like a Map except with two keys.

Answer 2

From documentation:

Interface Table

Type Parameters:

 R - the type of the table row keys C - the type of the table column keys V - the type of the mapped values 

Your declaration is right. In order to use it, should be easy as:

Table<String,String,Integer> table = HashBasedTable.create();
table.put("r1","c1",20);
System.out.println(table.get("r1","c1"));

Answer 3

Example of using : http://www.leveluplunch.com/java/examples/guava-table-example/

@Test
public void guava_table_example () {

    Random r = new Random(3000);

    Table<Integer, String, Workout> table = HashBasedTable.create();
    table.put(1, "Filthy 50", new Workout(r.nextLong()));
    table.put(1, "Fran", new Workout(r.nextLong()));
    table.put(1, "The Seven", new Workout(r.nextLong()));
    table.put(1, "Murph", new Workout(r.nextLong()));
    table.put(1, "The Ryan", new Workout(r.nextLong()));
    table.put(1, "King Kong", new Workout(r.nextLong()));

    table.put(2, "Filthy 50", new Workout(r.nextLong()));
    table.put(2, "Fran", new Workout(r.nextLong()));
    table.put(2, "The Seven", new Workout(r.nextLong()));
    table.put(2, "Murph", new Workout(r.nextLong()));
    table.put(2, "The Ryan", new Workout(r.nextLong()));
    table.put(2, "King Kong", new Workout(r.nextLong()));

    // for each row key
    for (Integer key : table.rowKeySet()) {

        logger.info("Person: " + key);

        for (Entry<String, Workout> row : table.row(key).entrySet()) {
            logger.info("Workout name: " + row.getKey() + " for elapsed time of " + row.getValue().getElapsedTime());
        }
    }
}