Guava小功能收集

自定義過濾條件的集合

listnumbers = lists.newarraylist(1, 2, 3, 6, 10, 34, 57, 89);

predicateaccepteven = new predicate() 
};listevennumbers = lists.newarraylist(collections2.filter(numbers, accepteven));
integer found = collections.binarysearch(evennumbers, 57);
assertthat(found, lessthan(0));

listwithnulls = lists.newarraylist("a", "bc", null, "def");

iterablewithoutnuls = iterables.filter(withnulls, predicates.notnull());
asserttrue(iterables.all(withoutnuls, predicates.notnull()));

listevennumbers = lists.newarraylist(2, 6, 8, 10, 34, 90);

predicateaccepteven = new predicate() 
};asserttrue(iterables.all(evennumbers, accepteven));

listevennumbers = lists.newarraylist(2, 6, 8, 10, 34, 90);

predicateacceptodd = new predicate() 
};asserttrue(iterables.all(evennumbers, predicates.not(acceptodd)));

listnumbers = lists.newarraylist(1, 2, 3);

listasstrings = lists.transform(numbers, functions.tostringfunction());
assertthat(asstrings, contains("1", "2", "3"));

listnumbers = arrays.aslist(2, 1, 11, 100, 8, 14);

orderingordering = ordering.natural().onresultof(functions.tostringfunction());
listinalphabeticalorder = ordering.sortedcopy(numbers);
listcorrectalphabeticalorder = lists.newarraylist(1, 100, 11, 14, 2, 8);
assertthat(correctalphabeticalorder, equalto(inalphabeticalorder));

listnumbers = arrays.aslist(2, 1, 11, 100, 8, 14);

predicateacceptevennumber = new predicate() 
};functionpoweroftwo = new function() }; 
fluentiterablepoweroftwoonlyforevennumbers = 
fluentiterable.from(numbers).filter(acceptevennumber).transform(poweroftwo);
assertthat(poweroftwoonlyforevennumbers, contains(4, 10000, 64, 196));

listnumbers = arrays.aslist(2, 3);

functionpoweroftwo = new function() 
};listresult = lists.transform(numbers, 
functions.compose(poweroftwo, poweroftwo));
assertthat(result, contains(16, 81));

listnumbers = lists.newarraylist(1, 2, 3, 6);

predicateacceptevennumber = new predicate() 
};functioniseventnumberfunction = functions.forpredicate(acceptevennumber);
listarenumberseven = lists.transform(numbers, iseventnumberfunction);
assertthat(arenumberseven, contains(false, true, false, true));

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