Alphanumeric sorting for list of objects in java

Question

Please help me out to sort the list of objects given below

Input: List list = [ob1,ob2,ob3,ob4] 
        ob1 = ["BH11", "val2", "val3"];
        ob2 = ["BH1", "val4", "val5"];
        ob3 = ["BH12", "val6", "val7"];
        ob4 = ["BH2", "val8", "val9"];

After sorting based upon values at index 0 of each object i.e. BH11, BH1 etc. Expected output : sortedList = [ob2,ob4,ob1,ob3]

Possible duplicate of Java comparator for multi-column sorting? — Alessandro Da Rugna
– Alessandro Da Rugna, Commented Dec 28, 2016 at 13:43

Guandan Chen · Accepted Answer · 2016-12-28 13:52:22Z

1

Try to use

Collection.sort(list, (a,b)->{return a[0].compareTo(b[0])});

answered Dec 28, 2016 at 13:52

Guandan Chen

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Coop · Accepted Answer · 2016-12-28 13:50:21Z

0

Implement the Comparable interface in the object class and override the compareTo() method to your liking. You can then use sort

See java documentation here: https://docs.oracle.com/javase/tutorial/collections/interfaces/order.html

answered Dec 28, 2016 at 13:50

Coop

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