public static void main(String[] args) {
String s1 = "0.3<=x<100,4.5";
Double d = 0.5;
ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
try {
String[] s1str = s1.split(",");
if(Boolean.parseBoolean(jse.eval(s1str[0].split("x")[0]+d)+"") ){
if(Boolean.parseBoolean(jse.eval(d+s1str[0].split("x")[1])+"")){
System.out.println(s1str[1]);
}
}
} catch (ScriptException e) {
e.printStackTrace();
}
}