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Yes, as others have stated, Eclipse doesn't automatically install a JDK; therefore, you will have to follow their advice to download/install a JDK/JRE.<br />
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Then you can use Ajay's suggestion or alternatively in Eclipse, Window --&gt; Preferences --&gt; Java --&gt; Installed JREs and click Add and then follow wizard to set Standard VM's java home, JARs, etc.
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Yes, as others have stated, Eclipse doesn't automatically install a JDK; therefore, you will have to follow their advice to download/install a JDK/JRE.

Then you can use Ajay's suggestion or alternatively in Eclipse, Window --> Preferences --> Java --> Installed JREs and click Add and then follow wizard to set Standard VM's java home, JARs, etc.

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&gt;&gt; alternatively in Eclipse, Window --&gt; Preferences --&gt; Java --&gt; Installed JREs and click Add and then follow wizard to set Standard VM's java home, JARs, etc.<br />
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For this eclipse must be running
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>> alternatively in Eclipse, Window --> Preferences --> Java --> Installed JREs and click Add and then follow wizard to set Standard VM's java home, JARs, etc.

For this eclipse must be running

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when i download eclipse it would ask JVM could not found.How could i solve this problem
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when i download eclipse it would ask JVM could not found.How could i solve this problem

when i download eclipse it would ask JVM could not found

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.