diff --git a/java_src/me/ehlxr/HelloWorld.java b/java_src/me/ehlxr/HelloWorld.java
index c2f91f6..9c888c9 100644
--- a/java_src/me/ehlxr/HelloWorld.java
+++ b/java_src/me/ehlxr/HelloWorld.java
@@ -1,25 +1,35 @@
 package me.ehlxr;
 
 class HelloWorld {
-    private static native String hello(String input);
-    private static native byte[] helloByte(byte[] input);
-    private static native void factAndCallMeBack(int n, HelloWorld callback);
-    private static native long counterNew(HelloWorld callback);
-    private static native void counterIncrement(long counter_ptr);
-    private static native void counterDestroy(long counter_ptr);
-    private static native void asyncComputation(HelloWorld callback);
-
-    private static native String fetchNameStr(HelloWorld param);
-
     static {
         // Linux: export LD_LIBRARY_PATH=/Users/ehlxr/Desktop/jni_rs/mylib/target/debug
         // Mac: export JAVA_LIBRARY_PATH=/Users/ehlxr/Desktop/jni_rs/mylib/target/debug
         System.loadLibrary("mylib");
     }
 
+    public long no;
+    private String name;
+    public int age;
+
+    private static native String hello(String input);
+
+    private static native byte[] helloByte(byte[] input);
+
+    private static native void factAndCallMeBack(int n, HelloWorld callback);
+
+    private static native long counterNew(HelloWorld callback);
+
+    private static native void counterIncrement(long counter_ptr);
+
+    private static native void counterDestroy(long counter_ptr);
+
+    private static native void asyncComputation(HelloWorld callback);
+
+    private static native String getFiled(HelloWorld param);
+
     public static void main(String[] args) {
-        // String output = HelloWorld.hello("Java");
-        // System.out.println(output);
+        String output = HelloWorld.hello("Java");
+        System.out.println(output);
 
         // byte[] outputByte = HelloWorld.helloByte("byte".getBytes());
         // System.out.println(outputByte);
@@ -29,7 +39,7 @@ class HelloWorld {
         // long counter_ptr = counterNew(new HelloWorld());
 
         // for (int i = 0; i < 5; i++) {
-        //   counterIncrement(counter_ptr);
+        //     counterIncrement(counter_ptr);
         // }
 
         // counterDestroy(counter_ptr);
@@ -37,28 +47,27 @@ class HelloWorld {
         // System.out.println("Invoking asyncComputation (thread id = " + Thread.currentThread().getId() + ")");
         // asyncComputation(new HelloWorld());
 
-
-        HelloWorld hw =  new HelloWorld();
-        hw.setNameStr("fsdfs");
-        System.out.println(HelloWorld.fetchNameStr(hw));
+        HelloWorld hw = new HelloWorld();
+        hw.setName("Jack");
+        hw.no = 123434555L;
+        hw.age = 30;
+        System.out.println(HelloWorld.getFiled(hw));
     }
 
-    private String nameStr;
-
-    public void setNameStr(String nameStr){
-      this.nameStr=nameStr;
+    public String getName() {
+        return name;
     }
 
-    public String getNameStr(){
-      return nameStr;
+    public void setName(String name) {
+        this.name = name;
     }
 
     public void factCallback(int res) {
-      System.out.println("factCallback: res = " + res);
+        System.out.println("factCallback: res = " + res);
     }
 
     public void counterCallback(int count) {
-      System.out.println("counterCallback: count = " + count);
+        System.out.println("counterCallback: count = " + count);
     }
 
     public void asyncCallback(int progress) {
diff --git a/mylib/src/lib.rs b/mylib/src/lib.rs
index 14c1b9c..063f45d 100644
--- a/mylib/src/lib.rs
+++ b/mylib/src/lib.rs
@@ -4,13 +4,32 @@ use jni::JNIEnv;
 use std::{sync::mpsc, thread, time::Duration};
 
 #[no_mangle]
-pub extern "system" fn Java_me_ehlxr_HelloWorld_fetchNameStr(
+pub extern "system" fn Java_me_ehlxr_HelloWorld_getFiled(
     env: JNIEnv,
     _class: JClass,
     input: JObject,
 ) -> jstring {
+    let age = env.get_field(input, "age", "I").unwrap().i().unwrap();
+    println!("get age field: {}", age);
+
+    let name: JString = env
+        .get_field(input, "name", "Ljava/lang/String;")
+        .unwrap()
+        .l()
+        .unwrap()
+        .into();
+    println!(
+        "get name field: {}",
+        String::from(env.get_string(name).unwrap())
+    );
+
+    let no = env.get_field(input, "no", "J").unwrap().j().unwrap();
+    // let jstr = env.get_string(JString::from(no)).unwrap();
+    // println!("get addr field: {}", String::from(jstr));
+    println!("get no field: {}", no);
+
     let out_str = if let JValue::Object(result) = env
-        .call_method(input, "getNameStr", "()Ljava/lang/String;", &[])
+        .call_method(input, "getName", "()Ljava/lang/String;", &[])
         .unwrap()
     {
         let jstr = env.get_string(JString::from(result)).unwrap();