Can we run a Java program without main method?

No. However until Java 7, we can execute by using static blocks. Prior to Java 7, the Jvm loads the class, execute static block before finding main method and invoke it. During this process, any code in the static block got executed.

// will not work in Java 7 and above.
public class Test {
    static {
        System.out.println("Static block executed.");
    }
}

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