How to call an method which resides in different project?

Question

I have Two separate projects in eclipse work space is same but different two projects. Suppose two project A & B, i have call an class suppose Test.java having main method and one simple display method from project b and i need to call from project B.In main method i am calling display method of Test.java class.

And suppose i have another class Execute.java in project A so i need call class from Project B in to Project A in Execute.java class, how do i do that?

Any suggestion will be appreciated

File : TestNGCreator.java

package testDrivers;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.testng.TestNG;
import org.testng.xml.XmlClass;
import org.testng.xml.XmlSuite;
import org.testng.xml.XmlTest;

import projlib.Globals;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Iterator;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;




public class TestNGCreator 
{

    public void runTestNGTest() throws IOException 
    {

            //Create an instance on TestNG
            TestNG myTestNG = new TestNG();

            //Create an instance of XML Suite and assign a name for it.
            XmlSuite mySuite = new XmlSuite();
            mySuite.setName(Globals.SUITE_NAME);

            //Create a list of XmlTests and add the Xmltest you created earlier to it.
            List<XmlTest> myTests = new ArrayList<XmlTest>();

            XSSFSheet excelWSheet = null;
            XSSFWorkbook excelWBook = null;
            XSSFCell cell = null;
            XSSFRow row = null;

            Double dblCellVal;
            String strCellVal = null;
            Boolean blnCellVal;

            FileInputStream excelFile = new FileInputStream(Globals.CONFIG_FILE_DIR);
            excelWBook = new XSSFWorkbook(excelFile);
            //excelWSheet = excelWBook.getSheet(Globals.CONFIG_SHEET_NAME);


            Iterator <Row> rowIterator = excelWSheet.iterator(); 
            //Iterator <Cell> cellIterator = row.cellIterator();
            String testName = null;
            int colCount;

            if (rowIterator.hasNext())
            {
                row = (XSSFRow) rowIterator.next();
                colCount = row.getPhysicalNumberOfCells();
            }
            while (rowIterator.hasNext())
            {
                row = (XSSFRow) rowIterator.next();
                Iterator <Cell> cellIterator = row.cellIterator();
                int curCell = 0;
                while (cellIterator.hasNext())
                {
                    cell = (XSSFCell) cellIterator.next();
                    curCell++;
                    switch (cell.getCellType())
                    {
                    case Cell.CELL_TYPE_NUMERIC:
                        dblCellVal = cell.getNumericCellValue();
                        strCellVal = dblCellVal.toString();
                        break;
                    case Cell.CELL_TYPE_STRING:
                        strCellVal = cell.getStringCellValue();
                        break;
                    case Cell.CELL_TYPE_BOOLEAN:
                        blnCellVal = cell.getBooleanCellValue();
                        strCellVal = blnCellVal.toString();
                        break;
                    }

                    //If it is first cell then store the Test Name
                    if (cell.getColumnIndex()== 0)
                    {
                        testName = strCellVal;
                    }

                    if (curCell == 5) {
                        if (strCellVal.equals("1.0")) {
                            //Adding to suite
                            //Create an instance of XmlTest and assign a name for it.
                            XmlTest myTest = new XmlTest(mySuite);
                            myTest.setName(testName);

                            //Add any parameters that you want to set to the Test.
                            Map<String, String> testngParams = new HashMap<String,String> ();
                            testngParams.put("testId", testName);
                            myTest.setParameters(testngParams);

                            //Create a list which can contain the classes that you want to run.
                            List<XmlClass> myClasses = new ArrayList<XmlClass> ();
                            myClasses.add(new XmlClass("TestDriver"));

                            //Assign that to the XmlTest Object created earlier.
                            myTest.setXmlClasses(myClasses);

                            //Adding the test to test list created earlier
                            myTests.add(myTest);
                            break;

                        }
                    }
                }

            }

            excelWBook.close();

            //add the list of tests to your Suite.
            mySuite.setTests(myTests);

            //Add the suite to the list of suites.
            List<XmlSuite> mySuites = new ArrayList<XmlSuite>();
            mySuites.add(mySuite);

            //Set the list of Suites to the testNG object you created earlier.
            myTestNG.setXmlSuites(mySuites);

            File file = new File(Globals.TESTNG_FILE_NAME);
            System.out.println("File is: " + file);

            FileWriter writer = new FileWriter(file);
            writer.write(mySuite.toXml());
            writer.close();

            //invoke run() - this will run your class.
            //myTestNG.run();




    }
    public static void main(String args[]) throws IOException
    {
        TestNGCreator testDriver = new TestNGCreator();
        testDriver.runTestNGTest();
    }
}

So i need to call main method.

Answer 1

You can do it by following below steps.

1. Build the first project and create jar
2. Right click on second project ->Build Path->Configure Build Path->Libraries->Add External Jars
3. Use the class from first project

Or

If you want to send/receive data from any web service, Please expose your method as REST API such a way that your web service will accept it.

You can use Apache HttpComponents to expose your method to web service, Please find the below sample code.

CloseableHttpClient client = HttpClients.custom().setDefaultRequestConfig(config)
                    .disableContentCompression().setSSLSocketFactory(sslsf).build();

HttpPost postRequest = new HttpPost(url);
client.execute(postRequest);

Answer 2

If you are not using Maven or Gradle you can perform the following steps in order to include the project:

Properties -> Build Path -> Projects -> Add , add the project you want.