Java 8 Lambda : Comparator

Java 8 makes your code much more readble and simpler.
In this post, I will show you Comparator example.

Beofre Java 8

I always had to write and put utility comparator for String in my program. Annoying...

package com.dukesoftware.utils.common;

import java.util.Comparator;

public enum StringComparator implements Comparator<String> {
    Instance;
    public int compare(String o1, String o2) {
        if(o1 == nul){
            if(o2 == null) return 0;
            return -1;
        }
        return o1.compareTo(o2);
    }

}

Of course you can use Java Commons library, but it is too much to add jar to buildpath only for small code snippet.

Java 8 Lambda Expression

See this code! Quite short!

Comparator.nullsFirst(Comparator.comparing(String::toString));