Java新特性玩转JDK8之函数式编程 Predicate超级大汇总—

Predicate: 断⾔型接⼝：有⼊参，有返回值，返回值类型确定是boolean
T：⼊参类型；出参类型是Boolean
调⽤⽅法：boolean test(T t);

@FunctionalInterface
public interface Predicate<T> {
boolean test(T t);
}

⽤途：接收⼀个参数，⽤于判断是否满⾜⼀定的条件，过滤数据

public static void main(String[] args) {
 List<String> list =
Arrays.asList("awewrwe","vdssdsd","aoooo","psdddsd");
 List<String> results = filter(list,obj->obj.startsWith("a"));
 System.out.println(results);
 }
 public static List<String> filter(List<String> list,
Predicate<String> predicate) {
 List<String> results = new ArrayList<>();
 for (String str : list) {
 if (predicate.test(str)) {
 results.add(str);
 }
 }
 return results;
 }

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