Add StringBuffer::setLength

Author: dlunch

java_runtime/src/classes/java/lang/string_buffer.rs

@@ -42,6 +42,7 @@ impl StringBuffer {
                 JavaMethodProto::new("append", "(C)Ljava/lang/StringBuffer;", Self::append_character, Default::default()),
                 JavaMethodProto::new("append", "([CII)Ljava/lang/StringBuffer;", Self::append_char_array, Default::default()),
                 JavaMethodProto::new("toString", "()Ljava/lang/String;", Self::to_string, Default::default()),
+                JavaMethodProto::new("setLength", "(I)V", Self::set_length, Default::default()),
             ],
             fields: vec![
                 JavaFieldProto::new("value", "[C", Default::default()),
@@ -214,6 +215,14 @@ impl StringBuffer {
 
         Ok(())
     }
+
+    async fn set_length(jvm: &Jvm, _: &mut RuntimeContext, mut this: ClassInstanceRef<Self>, length: i32) -> Result<()> {
+        tracing::debug!("java.lang.StringBuffer::setLength({:?}, {:?})", &this, length);
+
+        jvm.put_field(&mut this, "count", "I", length).await?;
+
+        Ok(())
+    }
 }
 
 #[cfg(test)]