Guava Table接口

http://www.yiibai.com/guava/guava_table.html

import java.util.Map;import java.util.Set;import com.google.common.collect.HashBasedTable;import com.google.common.collect.Table;public class GuavaTester {   public static void main(String args[]){      //Table<R,C,V> == Map<R,Map<C,V>>      /*      *  Company: IBM, Microsoft, TCS      *  IBM -> {101:Mahesh, 102:Ramesh, 103:Suresh}      *  Microsoft -> {101:Sohan, 102:Mohan, 103:Rohan }       *  TCS -> {101:Ram, 102: Shyam, 103: Sunil }       *       * */      //create a table      Table<String, String, String> employeeTable = HashBasedTable.create();      //initialize the table with employee details      employeeTable.put("IBM", "101","Mahesh");      employeeTable.put("IBM", "102","Ramesh");      employeeTable.put("IBM", "103","Suresh");      employeeTable.put("Microsoft", "111","Sohan");      employeeTable.put("Microsoft", "112","Mohan");      employeeTable.put("Microsoft", "113","Rohan");      employeeTable.put("TCS", "121","Ram");      employeeTable.put("TCS", "122","Shyam");      employeeTable.put("TCS", "123","Sunil");      //get Map corresponding to IBM      Map<String,String> ibmEmployees =  employeeTable.row("IBM");      System.out.println("List of IBM Employees");      for(Map.Entry<String, String> entry : ibmEmployees.entrySet()){         System.out.println("Emp Id: " + entry.getKey() + ", Name: " + entry.getValue());      }      //get all the unique keys of the table      Set<String> employers = employeeTable.rowKeySet();      System.out.print("Employers: ");      for(String employer: employers){         System.out.print(employer + " ");      }      System.out.println();      //get a Map corresponding to 102      Map<String,String> EmployerMap =  employeeTable.column("102");      for(Map.Entry<String, String> entry : EmployerMap.entrySet()){         System.out.println("Employer: " + entry.getKey() + ", Name: " + entry.getValue());      }   }}