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private final static ScriptEngineManager MANAGER = new ScriptEngineManager();
public static void main(String[] args) throws Exception {
ScriptEngine scriptEngine= MANAGER.getEngineByName("js");
scriptEngine.put("a",2);
scriptEngine.put("b",2);
System.out.println(scriptEngine.eval("if(a=1){b-100}else{5}"));
}