# [Java] Predicate.not()
###### tags: `Java`
Predicate.not()是在 Java 11 引入的靜態方法

### Java 11 之前:

List<String> haveBlank = list.stream()
                            .filter(String::isBlank)
                            .collect(Collectors.toList());

如果是希望篩選掉含有空白的字串會這樣寫

List<String> haveBlank = list.stream()
                            .filter(str -> ! str.isBlank())
                            .collect(Collectors.toList());

### Java 11 之後:

List<String> haveBlank = list.stream()
                            .filter(Predicate.not(String::isBlank))
                            .collect(Collectors.toList());

import static java.util.function.Predicate.not;
...
    
List<String> haveBlank = list.stream()
                            .filter(not(String::isBlank))
                            .collect(Collectors.toList());