You first enter cmd and enter "java-version" on the command line to see if there are any lines of text, including a JDK version similar to 1.7.0. If not, you need to download a java component JDK and JAVA environment. After installation, you need to configure several environment variables, one is classpath and the other is path, which specifies the root directory where JDK is installed. If you come out, you can enter the above command and try to start the game.