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法律研究如何從 Java 列表中篩選出空字串值？
假設我們有一個帶有空值的字串列表。這裡，在足球之前和壁球之後，我們有空陣列元素
List<String> sports = Arrays.asList("","Football", "Cricket", "Tennis", "Squash","", "Fencing", "Rugby");現在過濾掉空字串值。首先，我們已使用謂詞取反值
Stream<String> stream = sports.stream(); Predicate<String> empty = String::isEmpty; Predicate<String> emptyRev = empty.negate(); stream.filter(emptyRev).collect(Collectors.toList()));
以下是從列表中過濾空字串值的示例
示例
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
List<String> sports = Arrays.asList("","Football", "Cricket", "Tennis", "Squash","", "Fencing", "Rugby");
System.out.println("List with empty elements...");
for (String res : sports)
{
System.out.print(res+" ");
}
Stream<String> stream = sports.stream();
Predicate<String> empty = String::isEmpty;
Predicate<String> emptyRev = empty.negate();
System.out.println("
Strings after removing empty array values = "+stream.filter(emptyRev).collect(Collectors.toList()));
}
}輸出
List with empty elements... Football Cricket Tennis Squash Fencing Rugby Strings after removing empty array values = [Football, Cricket, Tennis, Squash, Fencing, Rugby]
更新於： 30-Jul-2019
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