Commit61164f2

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add more comparator samples as discussed on reddit:http://redd.it/20ng6r

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Original file line number	Diff line number	Diff line change
`@@ -29,6 +29,14 @@ public int compare(String a, String b) {`
`29`	`29`	`Collections.sort(names, (a,b) ->b.compareTo(a));`
`30`	`30`
`31`	`31`	`System.out.println(names);`
	`32`	`+`
	`33`	`+names.sort(Collections.reverseOrder());`
	`34`	`+`
	`35`	`+System.out.println(names);`
	`36`	`+`
	`37`	`+List<String>names2 =Arrays.asList("peter",null,"anna","mike","xenia");`
	`38`	`+names2.sort(Comparator.nullsLast(String::compareTo));`
	`39`	`+System.out.println(names2);`
`32`	`40`	`}`
`33`	`41`
`34`	`42`	`}`

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