从列表中移除满足 Java 中给定谓词的元素
原文:https://www . geeksforgeeks . org/remove-elements-from-list-the-to-self-given-predicate-in-Java/
以下是从满足谓词条件的列表中有效移除元素的方法:
p ==> Predicate, specifying the condition
l ==> List, from which element to be removed
使用迭代器
下面的程序演示了使用谓词 从列表中移除空元素
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to remove nulls
// from a List using iterator and Predicate
import java.util.function.Predicate;
import java.util.*;
class GFG {
// Generic function to remove Null Using Iterator
public static <T> List<T>
removeNullUsingIterator(List<T> l, Predicate<T> p)
{
// Create an iterator from the l
Iterator<T> itr = l.iterator();
// Find and remove all null
while (itr.hasNext()) {
// Fetching the next element
T t = itr.next();
// Checking for Predicate condition
if (!p.test(t)) {
// If the condition matches,
// remove that element
itr.remove();
}
}
// Return the null
return l;
}
public static void main(String[] args)
{
// Create the l with null values
List<String> l = new ArrayList<>(
Arrays.asList("Geeks",
null,
"forGeeks",
null,
"A computer portal"));
// Print the list
System.out.println("List with null values: " + l);
// Creating a Predicate condition checking for null
Predicate<String> isNull = item -> Objects.nonNull(item);
// Removing nulls using iterator and Predicate
l = removeNullUsingIterator(l, isNull);
// Print the list
System.out.println("List with null values removed: " + l);
}
}
Output
List with null values: [Geeks, null, forGeeks, null, A computer portal]
List with null values removed: [Geeks, forGeeks, A computer portal]
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