java中把判断大小的字符串转换成可判断的布尔值

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine se = manager.getEngineByName("js");
String str = "1<3";
boolean result = false;
try {
    result = (boolean) se.eval(str);
} catch (ScriptException e) {
    e.printStackTrace();
}