BlockingDeque的offerLast(E e)方法將在參數中傳遞的元素插入Deque容器的末尾。如果超出了容器的容量,則不會像add()和addLast()函數一樣返回異常。
用法:
public boolean offerLast(E e)
參數:此方法接受強製參數e,該參數是要在BlockingDeque末尾插入的元素。
返回值:如果已插入元素,則此方法返回true,否則返回false。
注意:BlockingDeque的offerLast()方法已從Java中的LinkedBlockingDeque類繼承。
以下示例程序旨在說明BlockingDeque的offerLast()方法:
示例1:
// Java Program Demonstrate offerLast()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>(4);
// Add numbers to end of BlockingDeque
BD.offerLast(7855642);
BD.offerLast(35658786);
BD.offerLast(5278367);
BD.offerLast(74381793);
// Cannot be inserted
BD.offerLast(10);
// cannot be inserted hence returns false
if (!BD.offerLast(10))
System.out.println("The element 10 cannot be inserted"
+ " as capacity is full");
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
輸出:
The element 10 cannot be inserted as capacity is full Blocking Deque: [7855642, 35658786, 5278367, 74381793]
示例2:
// Java Program Demonstrate offerLast()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<String> BD
= new LinkedBlockingDeque<String>(4);
// Add numbers to end of BlockingDeque
BD.offerLast("abc");
BD.offerLast("gopu");
BD.offerLast("geeks");
BD.offerLast("richik");
// Cannot be inserted
BD.offerLast("hii");
// cannot be inserted hence returns false
if (!BD.offerLast("hii"))
System.out.println("The element 'hii' cannot be"
+ " inserted as capacity is full");
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
輸出:
The element 'hii' cannot be inserted as capacity is full Blocking Deque: [abc, gopu, geeks, richik]
參考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#offerLast(E)
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注:本文由純淨天空篩選整理自gopaldave大神的英文原創作品 BlockingDeque offerLast() method in Java with examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。