java - sort list of objects based on field which is can be null -

java - sort list of objects based on field which is can be null -

how to sort list of objects based on field can null?

i trying in next way using comparator interface , collections sort method. class customclass , field on sorting done createdate

comparator comparator=new comparator<customclass>(){ public int compare(customclass o1, customclass o2) { if(o1.getcreatedate()==null && o2.getcreatedate()==null){ homecoming 0; } else if(o1.getcreatedate()==null && o2.getcreatedate()!=null){ homecoming 1; } else if(o1.getcreatedate()!=null && o2.getcreatedate()==null){ homecoming -1; } else{ if(o1.getcreatedate().equals(o2.getcreatedate())){ homecoming 0; } else if(o1.getcreatedate().after(o2.getcreatedate())){ homecoming 1; } else{ homecoming -1; } } } };

is there improve way it?

if you're willing utilize google guava, can utilize comparisonchain , ordering create things more succinct.

public int compare(customclass o1, customclass o2) { homecoming comparisonchain.start() .compare(o1.getcreatedate(), o2.getcreatedate(), ordering.natural().nullslast()) .result(); }

java sorting