React-Nativeエラー：JAVA_HOMEが設定されておらず、PATHに「java」コマンドが見つかりませんでした。

React Native Error Java_home Is Not Set

ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. Please set the JAVA_HOME variable in your environment to match the location of your Java installation. error Could not install the app on the device, read the error above for details. Make sure you have an Android emulator running or a device connected and have set up your Android development environment: https://facebook.github.io/react-native/docs/getting-started.html error Command failed: gradlew.bat app:installDebug. Run CLI with --verbose flag for more details. This problem occurs when running react-native,

まず、インストールされているかどうかを確認しますjava jdk

そして、環境変数を構成します