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package demo1; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import java.util.Scanner; public class demo1 { public static void main(String args[]) throws Exception{ String string = "3+3+2+1"; ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine scriptEngine = manager.getEngineByName("JavaScript"); System.out.println((Integer)scriptEngine.eval(string)); } }