Best practices for Java methods to return multiple values?

See English answers > how to return multiple objects from a Java method? twenty-three

Solution 1

private boolean aMethod(int aParam,Object obj) { ...set obj parameter & return value... }

Solution 2

private Pair<Boolean,Object> aMethod(int aParam) { ...set return pair values... }

Solution 3

private Object obj;
...
private boolean aMethod(int aParam) { ...set obj field & return value... }

Solution 4

private class MethodReturn { // Nested class - Could be a separate class instead
    boolean success;
    Object obj;
    // ... Getters and setters omitted for brevity
}

private MethodReturn aMethod(int aParam) { ...set return object values... }

Is there any more possibility that I may have missed it? Anyone can comment on everyone's pros and cons (ideally best used in most cases)?

Solution

Generally speaking, according to the specific situation, I will go to layer 4 or map, but if you need to return multiple irrelevant values, I think you have a serious design problem (check https://en.wikipedia.org/wiki/Single_responsibility_principle )

In specific cases (after your comments), I will definitely use the fourth modeling response with all the required fields Perhaps you can also subtype using responsesuccessful and responsefailure