This is a basic example where a developer call, from a Java application, the simple class defined in a file named CSharpClass.cs.
Let’s consider the following C# code:
using System; namespace MASES.CLRTests { public class CSharpClass { /// <summary>The method <c>HelloWorld</c> return the "Hello World!!" string</summary> public String HelloWorld() { return "Hello World from C#!!"; } /// <summary>The method <c>Add</c> return the sum of two double</summary> public double Add(double a, double b) { return a + b; } /// <summary>The method <c>Add</c> return the sin of a double</summary> public double Sin(double a) { return Math.Sin(a); } } }
Compiling it with the preferred development tools an assembly will be generated.
Create a Java class named CSharpClassUseExample.java with the following content:
import java.io.IOException; import org.mases.jcobridge.*; public class CSharpClassUseExample { public static void main(String[] args) { try { try { try { JCOBridge.Initialize(); } catch (JCException e) { e.printStackTrace(); } } catch (IOException e) { e.printStackTrace(); } //declare and create JCOBridge instance JCOBridge bridge; bridge = JCOBridge.CreateNew(); // adds the path where extarnal assemblies where found bridge.AddPath("./"); // add REFERENCES to the .dll file bridge.AddReference("CSharpClass"); // GENERATE Object JCObject cso = (JCObject) bridge.NewObject("MASES.CLRTests.CSharpClass"); double a = 2; double b = 3; double c = Math.PI/2; //Invoke the C# class methods String hello = (String) cso.Invoke("HelloWorld"); double result = (double) cso.Invoke("Add",a, b); double sin = (double) cso.Invoke("Sin", c); System.out.println(String.format("%s %.0f + %.0f = %.0f and sin(%.8f) = %.8f", hello, a, b, result, c, sin)); } catch (JCException jce) { jce.printStackTrace(); System.out.println("Exiting"); return; } } }
Save the file in the same folder where is located the assembly generated from C# project and execute the Java class as standard Main-Class.
Executing the code the following output will be generated:
Hello World from C#!! 2 + 3 = 5 and sin(3,14159265) = 1,00000000