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It worked ! Thank you so much for eloborated instructions :))

Forgive me sir, I am just a beginner. I have copied-pasted the older one to Command Prompt C:\robocode>java -Dsun.java2d.opengl=true -Xmx512M -cp "libs/" -XX:+IgnoreUnrecognizedVMOptions "--add-opens=java.base/sun.net.www.protocol.jar=ALL-UNNAMED" "--add-opens=java.base/java.lang.reflect=ALL-UNNAMED" "--add-opens=java.desktop/javax.swing.text=ALL-UNNAMED" "--add- opens=java.desktop/sun.awt=ALL-UNNAMED" robocode.Robocode % like this and then encounter an error "Could not find or load main class robocode.Robocode"...

Hello, I have downloaded Robocode, and installed without any problem. However when I click its icon on the desktop, firstly the promt appears and after a second it disappears. And nothing started. I have JAVA 8, JDK and JRE already. Could you help me please ?