大橙子网站建设,新征程启航
为企业提供网站建设、域名注册、服务器等服务
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.collections4.CollectionUtils;
public class StreamUtil {
private StreamUtil() {
throw new IllegalArgumentException(“Utility class”);
}
public static void consumerList(List list, Consumer consumer) {
if (!CollectionUtils.isEmpty(list)) {
list.stream().forEach(consumer);
}
}
public staticListmapList(Listlist, Functionfunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyList() : (List)list.stream().map(function).collect(Collectors.toList());
}
public staticListfilterList(Listlist, Predicatepredicate) {
return CollectionUtils.isEmpty(list) ? Collections.emptyList() : (List)list.stream().filter(predicate).collect(Collectors.toList());
}
public staticListmultiFilterList(Listlist, Predicate... predicates) {
if (CollectionUtils.isEmpty(list)) {
return Collections.emptyList();
} else {
Streamstream = list.stream();
Predicate[] var3 = predicates;
int var4 = predicates.length;
for(int var5 = 0; var5< var4; ++var5) {
Predicatepredicate = var3[var5];
stream = stream.filter(predicate);
}
return (List)stream.collect(Collectors.toList());
}
}
public staticMaplistToMap(Listlist, Functionfunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyMap() : (Map)list.stream().collect(Collectors.toMap(function, Function.identity()));
}
public staticListfilterAndMapList(Listlist, Predicatepredicate, Functionfunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyList() : (List)list.stream().filter(predicate).map(function).collect(Collectors.toList());
}
public staticMapfilter2Map(Setlist, Predicatepredicate, FunctionkeyFunction, FunctionvalueFunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyMap() : (Map)list.stream().filter(predicate).collect(Collectors.toMap(keyFunction, valueFunction));
}
public staticMapmapCollect2Map(Listlist, FunctionmapFunction, FunctionkeyFunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyMap() : (Map)list.stream().map(mapFunction).collect(Collectors.toMap(keyFunction, Function.identity()));
}
public staticMapcollect2Map(Listlist, FunctionkeyFunction, FunctionvalueFunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyMap() : (Map)list.stream().collect(Collectors.toMap(keyFunction, valueFunction));
}
public staticMap>list2GroupMap(Listlist, FunctionkeyFunction) {
return CollectionUtils.isEmpty(list) ? Collections.emptyMap() : (Map)list.stream().collect(Collectors.groupingBy(keyFunction));
}
public staticListlistDistinct(Listlist) {
return (List)list.stream().distinct().collect(Collectors.toList());
}
public staticListlist2MapAndDistinct(Listlist, Functionfunction) {
return (List)list.stream().map(function).distinct().collect(Collectors.toList());
}
}
你是否还在寻找稳定的海外服务器提供商?创新互联www.cdcxhl.cn海外机房具备T级流量清洗系统配攻击溯源,准确流量调度确保服务器高可用性,企业级服务器适合批量采购,新人活动首月15元起,快前往官网查看详情吧