Guava Table Example

Guava Table

A special collection that allows us to use two keys as indexes, a row key and a column key with a value. Trying to achieve the same this using Java Collections you you need to have something like <CompanyName, <Map EmployeeName, YearsOfService>> which is ugly at best and a bit on the unwieldy side. However, by using Guava Table HashBasedTable you are able to create and maintain quite easily.

@GwtCompatible
public interface Table<R,C,V>

Guava Table Methods Available

Guava Table Implementations

There are four implementation classes available for Table:

• HashBasedTable
• TreeBasedTable
• ImmutableTable
• ArrayTable

Guava Table Java Example

package com.avaldes;

import java.util.Map;

import com.google.common.collect.HashBasedTable;
import com.google.common.collect.Table;

public class GuavaTableExample {
  public static void main(String[] args) {
    Table<String, String, Double> employeeYearsOfService = HashBasedTable.create();
    // Employer is the Row, Employee Name is the Column, # of Years is the Value
    employeeYearsOfService.put("AT&T", "Amaury Valdes", 1.4);
    employeeYearsOfService.put("Microsoft", "Bill Smith", 13.2);
    employeeYearsOfService.put("Google", "Dan Houston", 11.5);
    employeeYearsOfService.put("Microsoft", "Stacy Lerner", 3.5);
    employeeYearsOfService.put("AT&T", "Michelle Bailey", 2.0);
    employeeYearsOfService.put("Google", "Bill Smith", 9.75);
    
    System.out.println("\n---[Find all AT&T Employees]-----");
      Map<String,Double> attEmployees =  employeeYearsOfService.row("AT&T");
      for(Map.Entry<String, Double> employee : attEmployees.entrySet()){
        System.out.println("Employee Name: " + employee.getKey() + ", Years of Service: " + employee.getValue());
      }
      
    System.out.println("\n---[Find all Employees Named 'Bill Smith']-----");
      Map<String,Double> employees =  employeeYearsOfService.column("Bill Smith");
      
      
      for(Map.Entry<String, Double> employee : employees.entrySet()){
        System.out.println("Employee Company: " + employee.getKey() + ", Years of Service: " + employee.getValue());
      }
  }
}

That’s It!

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