在类非法表达式开头中找不到主要方法

像这样添加主要

..............................................................public class MQN {    TopologyAnalyser ta = new TopologyAnalyser();    HBDAPlugin hbda = new HBDAPlugin();    public static void main(String [] args) {        // This is where the execution of the program will begin    }    public String calculateMQN(Molecule m) {        if (!m.dearomatize()) { System.out.println("DEAROMATIZE ERROR");    .............    ..............

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