feat: add java&rust

__lang/java/java-rust-demo/Cargo.lock

@@ -0,0 +1,179 @@
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__lang/java/java-rust-demo/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "java-rust-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ['cdylib']
+
+[dependencies]
+jni = {version = '0.19'}
+

__lang/java/java-rust-demo/src/lib.rs

@@ -0,0 +1,7 @@
+use jni::objects::*;
+use jni::JNIEnv;
+
+#[no_mangle]
+pub unsafe extern "C" fn Java_me_hatter_RustJNI_init(_env: JNIEnv, _class: JClass) {
+    println!("rust-java-demo inited");
+}