JavaClassMBS.AllocateObject as JavaObjectMBS

Returns a reference to the object or nil on any error.

Does not work for array classes.
Throws InstantiationException if the class is an interface or an abstract class.

JavaClassMBS.Fields as JavaFieldMBS()

// List field names

Var vm as JavaVMMBS  // your VM
Var jclass As JavaClassMBS = vm.FindClass("test")
Var fields() As JavaFieldMBS = jclass.Fields
Var fieldNames() As String

For Each field As JavaFieldMBS In fields
  fieldNames.add field.Name
Next

MessageBox String.FromArray(fieldNames, EndOfLine)

This includes static fields.
Does not include items from super class.

JavaClassMBS.GetField(name as string, sig as string) as JavaFieldMBS

Nil on any error.

The signature is a string derived from the field's type or method's arguments and return type, as shown here:

Java Type	Signature
boolean	Z
byte	B
char	C
short	S
int	I
long	L
float	F
double	D
void	V
objects	Lfully-qualified-class-name;
arrays	[array-type
methods	(argument-types)return-type

JavaClassMBS.GetMethod(name as string, sig as string) as JavaMethodMBS

Var jclass as JavaClassMBS
Var method as JavaMethodMBS

method=jclass.GetMethod("mymethod", "([Ljava/lang/String;)V")

Returns the method ID for an instance (non-static) method of a class or interface. The method may be defined in one of the the class's super classes and inherited by the class. The method is determined by its name and signature.

To obtain the method ID of a constructor, supply <init> as the method name and void (V) as the return type.

Nil on any error.

Throws NoSuchMethodError if the specified method cannot be found.

The signature is a string derived from the field's type or method's arguments and return type, as shown here:

Java Type	Signature
boolean	Z
byte	B
char	C
short	S
int	I
long	L
float	F
double	D
void	V
objects	Lfully-qualified-class-name;
arrays	[array-type
methods	(argument-types)return-type

Some examples using this method:

• /Java/JavaTest/Java

JavaClassMBS.GetStaticField(name as string, sig as string) as JavaFieldMBS

Nil on any error.

Some examples using this method:

• /Java/JavaTest/Java

JavaClassMBS.GetStaticMethod(name as string, sig as string) as JavaMethodMBS

Var jclass as JavaClassMBS
Var method as JavaMethodMBS

method=jclass.GetStaticMethod("main", "([Ljava/lang/String;)V")

Nil on any error.
e.g. the signature of the default static main method is "([Ljava/lang/String;)V" which means return type void at the end and before an array of string.

Some examples using this method:

• /Java/Java Get System Property
• /Java/Java Set System Property
• /Java/JavaTest/Java

JavaClassMBS.Methods as JavaMethodMBS()

// List method names

Var vm as JavaVMMBS  // your VM
Var jclass As JavaClassMBS = vm.FindClass("test")
Var Methods() As JavaMethodMBS = jclass.Methods
Var MethodNames() As String

For Each Method As JavaMethodMBS In Methods
  MethodNames.add Method.Name
Next

MessageBox String.FromArray(MethodNames, EndOfLine)

This includes constructors with name "<init>", private, protected, public and static methods.
Does not include items from super class.

JavaClassMBS.NewObject(methodID as JavaMethodMBS, args as memoryblock) as JavaObjectMBS

The method ID indicates which constructor method to invoke. This ID must be obtained by calling GetMethod with <init> as the method name and void (V) as the return type.

Returns nil on any error.

Programmers place all arguments to the method in an args memoryblock that immediately follows the methodID argument.
In the memoryblock you need to use 8 bytes per argument and align them correctly. (alignment depends on platform)

Throws Java InstantiationException if the class is an interface or an abstract class.

See also:

• NewObject(MethodID as JavaMethodMBS, args() as Variant) as JavaObjectMBS

JavaClassMBS.NewObject(MethodID as JavaMethodMBS, args() as Variant) as JavaObjectMBS

Var vm as JavaVMMBS // your initialized VM

// 1. Find class
Var jclass As JavaClassMBS=vm.FindClass("stringtest")

If jclass = Nil Then
  MsgBox "Can't find stringtest class"
  Return
End If

// 2. Call constructor
Var jmethod As JavaMethodMBS = jclass.GetMethod("<init>", "(ILjava/lang/String;D)V")

If jmethod = Nil Then
  MsgBox "Can't find constructor"
  Return
End If

Var param() As Variant
// 1. Parameter with Integer: I
param.Append 123
// 2. Parameter with string: Ljava/lang/String;
param.Append "Hello World"
// 3. Parameter with double: D
param.Append 3.14
Var jobject As JavaObjectMBS = jclass.NewObject(jmethod, param)

If jobject = Nil Then
  MsgBox "Constructor failed!?"
Else
  MsgBox "OK: "+jobject.ClassName
End If

The method ID indicates which constructor method to invoke. This ID must be obtained by calling GetMethod with <init> as the method name and void (V) as the return type.

Returns nil on any error.

Programmers place all arguments to the method in an args variant array that immediately follows the methodID argument.

Throws Java InstantiationException if the class is an interface or an abstract class.

This is generic version, where our plugin translates between native Xojo data types and Java data types. We support conversion of boolean, byte (integer), char (integer), short (integer), int (integer), long (int64), double, float (single) and Java objects. Objects can be JavaObjectMBS or subclasses including JavaStringMBS and the JavaArrayMBS subclasses. For your convenience you can pass in string and we convert to JavaStringMBS for you.

See also:

• NewObject(methodID as JavaMethodMBS, args as memoryblock) as JavaObjectMBS