Java Reference
In-Depth Information
Listing 6-9. A MainTest1 Class, Which Declares a main() Method
// MainTest1.java
package com.jdojo.cls;
public class MainTest1 {
public static void main(String[] args) {
System.out.println("Inside main() method of the MainTest1 class.");
}
}
Listing 6-10. A MainTest2 Class, Which Declares a main() Method, Which in Turn Calls the main() Method of the
MainTest1 Class
// MainTest2.java
package com.jdojo.cls;
public class MainTest2 {
public static void main(String[] args) {
MainTest1.main(args);
}
}
Inside main() method of the MainTest1 class.
The main() method of the MainTest2 class invokes the main() method of the MainTest1 class using the
following code:
MainTest1.main(null);
Note that the main() method of the MainTest1 class accepts a String array as a parameter and the above
statement passes null as the actual value for that parameter. I will discuss arrays in detail in the chapter on arrays. You
run the MainTest2 class as
java com.jdojo.cls.MainTest2
The JVM will invoke the main() method of the MainTest2 class, which in turn invokes the main() method of the
MainTest1 class. The output in Listing 6-10 confirms this. You can also let the JVM invoke the main() method of the
MainTest1 class by running the MainTest1 class as
java com.jdojo.cls.MainTest1
the main() method in a class, which is declared as public static void main(String[] args) , has a special
meaning only when the class is run by the jVM. It serves as an entry point for the java application. Otherwise, the main()
method is treated the same as any other class methods.
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