疯狂的狮子li
2022-07-05 0d8510b8b37c08092958e01f2f06f079343d38fd
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
package com.ruoyi.common.utils;
 
import cn.hutool.core.collection.CollStreamUtil;
import cn.hutool.core.collection.CollUtil;
 
import java.util.*;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
 
public class StreamUtils extends CollStreamUtil {
 
    public static <E> List<E> filter(Collection<E> collection, Predicate<E> function) {
        if (CollUtil.isEmpty(collection)) {
            return Collections.emptyList();
        }
        return collection.stream().filter(function).collect(Collectors.toList());
    }
 
    public static <E> String join(Collection<E> collection,  Function<E, String> function) {
        return join(collection, function, ",");
    }
 
    public static <E> String join(Collection<E> collection,  Function<E, String> function, CharSequence delimiter) {
        if (CollUtil.isEmpty(collection)) {
            return StringUtils.EMPTY;
        }
        return collection.stream().map(function).filter(Objects::nonNull).collect(Collectors.joining(delimiter));
    }
 
    public static <E> List<E> sorted(Collection<E> collection, Comparator<E> comparing) {
        return collection.stream().sorted(comparing).collect(Collectors.toList());
    }
}