version: "3.9"

services:
  app:
    image: eclipse-temurin:21-jdk
    working_dir: /app
    volumes:
      - ./src:/app           # ← bind mount（ホストの ./src を /app に）
    tty: true
    stdin_open: true
    command: bash
    # # command: bash -lc "javac Hello.java && java Hello"