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Why do we need main method to execute a java program?
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Main method is auto called by JVM. It is the place, where JVM enters into the class. It is called before the class is instantiated by its constructor. There are below reasons on its signature.
1. Public access modifier: it is visible to outer environment called JVM.
2. Static non-access modifier: it is called before the class is instantiated, hence JVM use class name to call the main method.
3. Void return type: It return no value to JVM.
4. String array parameter: It takes command line arguments.
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