Java 中 link edblockingrequeremoveif()方法示例
原文:https://www . geeksforgeeks . org/linkedblockingrequest-removeif-method-in-Java-with-examples/
链接锁定请求的 removeIf() 方法从该链接锁定请求中移除满足指定条件的元素。
语法:
public boolean removeIf (Predicate<? super E> filter)
参数:该方法接受一个强制参数过滤器，该过滤器是谓词值，基于该值可以从该 Deque 中移除哪些元素。
返回:如果链接锁定请求被更改，该方法返回一个布尔值如真。否则此方法返回 false。
异常:如果指定的谓词过滤器为空，此方法将抛出空指针异常。
下面的程序说明了 LinkedBlockingDeque 类的 removeIf()函数:
程序 1:
// Java Program Demonstrate removeIf()
// method of LinkedBlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// Create object of LinkedBlockingDeque
LinkedBlockingDeque<Integer> LBD
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of LinkedBlockingDeque
LBD.add(7855642);
LBD.add(35658786);
LBD.add(5278367);
LBD.add(74381793);
// Print Deque
System.out.println("Linked Blocking Deque: "
+ LBD);
// If a number in the List is
// divisible by 3, then remove it
LBD.removeIf(number -> number % 3 == 0);
System.out.println("Linked Blocking Deque: "
+ LBD);
}
}
输出:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque: [7855642, 5278367]
程序二:
// Java Program Demonstrate removeIf()
// method of LinkedBlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws InterruptedException
{
// Create object of LinkedBlockingDeque
LinkedBlockingDeque<Integer> LBD
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of LinkedBlockingDeque
LBD.add(7855642);
LBD.add(35658786);
LBD.add(5278367);
LBD.add(74381793);
// Print Dequeue
System.out.println("Linked Blocking Deque: "
+ LBD);
try {
// if the predicate is null,
// then it will throw NullPointerException
LBD.removeIf(null);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
java.lang.NullPointerException
版权属于：月萌API www.moonapi.com，转载请注明出处
