import static java.util.stream.Collectors.*;
import java.util.*;
import java.lang.*;
//import java.util.Collections;
public class HelloWorld{
public static void main(String []args){
System.out.println("Hello World");
List<String> strings = Arrays.asList("abc", "", "bc", "efg", "abcd","", "jkl");
List<String> filtered = strings.stream().filter(string -> !string.isEmpty()).collect(Collectors.toList());
}
}
output
/tmp/java_tdo3eB/HelloWorld.java:10: error: cannot find symbol
List<String> filtered = strings.stream().filter(string -> !string.isEmpty()).collect(Collectors.toList());
^
symbol: variable Collectors
location: class HelloWorld
1 error
所以我想知道为什么我无法使用收集器,因为我也导入了该类
这是你的进口货。这样做:
package experiments;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
/**
*
* @author Luc Talbot
*/
public class HelloWorld {
public static void main(String []args){
System.out.println("Hello World");
List<String> strings = Arrays.asList("abc", "", "bc", "efg", "abcd","", "jkl");
List<String> filtered = strings.stream()
.filter(string -> !string.isEmpty())
.collect(Collectors.toList());
}
}
输出是:
跑步:
你好世界
构建成功(总时间:0 秒)
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