Is it possible that write a program with Java bytecode instructions directly?

Question

In .NET platform it is possible to write a program with Common Intermediate Language directly and compile the sources with IL Assembler (ILASM).

For example below code is "Hello World" program.

.assembly Hello {}
.assembly extern mscorlib {}
.method static void Main()
{
    .entrypoint
    .maxstack 1
    ldstr "Hello, world!"
    call void [mscorlib]System.Console::WriteLine(string)
    ret
}

Is it possible that write a program with Java bytecode instructions directly like .NET?

Answer 1

You can check out Jasmin. From Wikipedia,

Some projects provide Java assemblers to enable writing Java bytecode by hand. Assembly code may be also generated by machine, for example by compiler targeting Java virtual machine. Notable Java assemblers include:

Jasmin, takes textual descriptions for Java classes, written in a simple assembly-like syntax using Java Virtual Machine instruction set and generates a Java class file.

Jamaica, a macro assembly language for the Java virtual machine. Java syntax is used for class or interface definition. Method bodies are specified using bytecode instructions.

Note: I've not used any of these tools personally.