package com.example;

public class EqualsA {

	private int a;

	public void execute() {
		System.out.println("start");

		if (a == 1 && a == 2 && a == 3) {
			System.out.println(true);
		} else {
			System.out.println(false);
		}

		System.out.println("end");
	}
}

package com.example;

import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.expr.ExprEditor;
import javassist.expr.FieldAccess;

public class EqualsMain {

	public static void main(String[] args) throws Exception {
		convert();

		new EqualsA().execute();
	}

	static void convert() throws Exception {
		ClassPool classPool = ClassPool.getDefault();
		CtClass cc = classPool.get("com.example.EqualsA");
		cc.instrument(new ExprEditor() {

			private int i = 1;

			@Override
			public void edit(FieldAccess f) throws CannotCompileException {
				if (f.getFieldName().equals("a")) {
					f.replace(String.format("$_ = %d;", i++));
				}
			}
		});

		cc.toClass();
	}
}

object EqualsA {
  def main(args: Array[String]): Unit = {
    val a = Int(1)
    if (a == 1 && a == 2 && a == 3) {
      println("true")
    } else {
      println("false")
    }
  }

  case class Int(n: scala.Int) {
    override def equals(other: Any) = true
  }
}

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