getting error when i write java program in eclipse

I installed eclipse in my system when i wrote some sample hello world 开发者_StackOverflowprogram in that its throwing me error like launching hello world has encountered problem. The specified JRE does not exist.

Any1 help me on this

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Have you checked your settings in "Preferences -> Java -> Installed JREs"?

Also you could try to (re)install Java SE (JDK)