(Official Java development engineer QQ group (27163376), please enter your ID for verification. It's very simple, and it needs to be improved, please improve together! The local netizens who are insufficient can give advice! You only need to have the java operating environment JDK, compile the calculator.java file, then create a text file, and run calculator.html directly to see the effect , but you can't even multiply, divide, add, and subtract.
MyCalculator3\.settings\org.eclipse.jdt.core.prefs
MyCalculator3\bin\Calculator$1.class
MyCalculator3\bin\Calculator$2.class
MyCalculator3\bin\Calculator$3.class
MyCalculator3\bin\Calculator$Listener.class
MyCalculator3\bin\Calculator.class
MyCalculator3\src\Calculator.java
MyCalculator3\.classpath
MyCalculator3\.project
.....too many files .....)