Is there a proficient way to set a string to some default value if assignment gives nullPointerException?
Say im initializing a string like this:
String myString= jsonElement.getAsJsonObject().get("myString").getAsString();
If it gives nullPointer i need to give it a default value, i know i can do it with an "if" check after but is that the only way? It would mean alot of checks as i am initiating around 20 strings.
Is there any way to do it like:
String myString = jsonElement.getAsJsonObject().get("myString")
.getAsString() || "defaultValue";
您可以为此使用Optional
,如下所示:
Optional.of(jsonElement).map(element -> element.getAsJsonObject()).map(o -> o.get("myString")).map(e -> e.getAsString()).orElse("defaultValue");
How about make a method to do that.
String getOrDefault(JsonElement jsonElement, String key)
JsonObject obj = jsoneElement.getAsJsonObject().get(key);
return obj==null?"default":obj.getAsString();
}
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