How to get the count of Checkboxes and Select them all

Lets take a webpage having multiple check boxes. How do I get the count of all checkboxes and how do I select them

1.Go to the following link and you will find checkboxes under Search Language. Below Code Snippet instructs selenium to get the check box count and select all the checkboxes one by one

    http://www.google.co.in/preferences?hl=en

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.openqa.selenium.server.SeleniumServer;
import com.thoughtworks.selenium.DefaultSelenium;
import com.thoughtworks.selenium.Selenium;

public class AjaxTests {
    static SeleniumServer server;
    static Selenium selenium;

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        server = new SeleniumServer();
        server.start();

        selenium = new DefaultSelenium("localhost", 4444, "*iexploreproxy",
                "http://www.google.com");
        selenium.start();
        selenium.open("/preferences?hl=en");
        selenium.windowMaximize();
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
        selenium.close();
        selenium.stop();
        server.stop();
    }
  

    @Test
    public void testAllCheckBoxes(){
         //Get the count of all available check boxes

         int checkBoxCount = selenium.getXpathCount("//form[@name='langform']/table[5]/tbody/tr[2]/td[3]
                                          /table/tbody/tr/td/font[1]/label/input").intValue();
        //Print the Check box count
        System.out.println("Total Number of Check box count is : " + checkBoxCount );
        int count = selenium.getXpathCount("//form[@name='langform']/table[5]/tbody/tr[2]/td[3]/table/tbody
                          /tr/td[1]/font[1]/label").intValue();
        System.out.println(count);
        for (int i = 1; i <=4; i++) {
            for (int j = 1; j <= count; j++) {
                if(i == 4 && j == 11){
                    break;
                }
                selenium.check("//form[@name='langform']/table[5]/tbody/tr[2]/td[3]/table/tbody/tr/td[" + i +
                              "]/font[1]/label"+"[" + j +"]/input");
              
            }
        }
      
    }
  
}