Created 18.01 branch of the documentation.

git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@1942 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
2025-12-07 23:32:42 +01:00 · 2018-02-08 15:00:31 +00:00
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+[[Property:title|Eiffel2Java Sample]]
+[[Property:weight|1]]
+[[Property:uuid|90ef17d4-8e23-34dd-1cb8-488533561dd4]]
+This example shows how to create an instance of the Java Virtual Machine and the creation of an object of type <eiffel>test</eiffel>, a java class reproduced below: 
+<code lang="java">
+(Java Code)
+
+class test 
+{
+	test () 
+	{
+		my_integer = 10;
+	}
+
+	public int my_integer;
+	public static int my_static_integer;
+	public void my_method (int arg_int, String arg_string) 
+	{		
+		my_static_integer = arg_int;
+		my_integer = arg_int;
+	}
+}
+</code>
+
+In order to run properly you need to read [[Eiffel2Java|the library requirement]] . 
+
+===Compiling the example===
+
+Since the example is using the `test.java` class, the first step is to compile the java class using the `javac` command line utility from the JDK. Once it is done, copy the `test.class` either into $ISE_EIFFEL\examples\Eiffel2Java\EIFGENs\classic\W_code or else into $ISE_EIFFEL\examples\Eiffel2Java\EIFGENs\classic\F_code, depending on your compilation mode (freezing vs. finalizing).
+
+===Running the example===
+
+Once the example is compiled, you can run it and here is the expected output:
+<code>
+$ sample
+Creating instance of class `test'
+Value of `my_integer' is 10
+Value of `my_static_integer' is 0
+Calling `my_method' with (2, "String test")
+Value of `my_integer' after call to `my_method' is 2
+</code>
+
+===Code description===
+<code>(Eiffel Code)
+		
+class
+    EIFFEL_TO_JAVA
+inherit
+    SHARED_JNI_ENVIRONMENT
+
+create
+    make
+
+feature -- Creation
+	
+    make
+        local
+            class_test: JAVA_CLASS
+            instance_of_class_test: JAVA_OBJECT	
+            fid: POINTER
+            value: INTEGER
+            j_args: JAVA_ARGS
+        do
+                --| Creation of the Java object
+            class_test := jni.find_class ("test")
+            create instance_of_class_test.create_instance (class_test, "()V", Void)
+			
+                --| Access to a public attribute
+            fid := instance_of_class_test.field_id ("my_integer", "I")
+			
+                -- 'fid' contains the id of the field 'my_integer'
+                -- 'value' contains the value of the field referenced	
+                -- by 'fid'
+				
+            value := instance_of_class_test.integer_attribute (fid)
+			
+                --| Access to a static attribute using directly the JAVA_CLASS
+            fid := class_test.field_id ("my_static_integer", "I")
+            value := class_test.integer_attribute (fid)
+
+			
+                --| Access to a static attribute using the attribute 'jclass'
+            fid := instance_of_class_test.jclass.field_id ("my_static_integer", "I")
+            value := instance_of_class_test.jclass.integer_attribute (fid)
+			
+                --| Access to the method 'my_method'
+                -- Get the id of 'my_method'
+            fid := instance_of_class_test.method_id ("my_method", "(ILjava/lang/String;)V")	
+
+                -- Create the set of arguments for 'my_method'
+            create j_args.make(2)
+            j_args.push_int (2)
+            j_args.push_string("String test")
+			
+                -- Create the set of arguments for 'my_method'
+                -- Call to the void method referenced by 'fid'
+            instance_of_class_test.void_method (fid, j_args)
+        end -- make
+		
+end -- class EIFFEL_TO_JAVA</code>
+
+
+
+