Java 中的 Deque descendingIterator()方法
原文:https://www . geeksforgeeks . org/deque-dependingiterator-method-in-Java/
反求接口的下降迭代器(E e) 方法以相反的顺序返回该反求中元素的迭代器。元素将按从最后(尾部)到第一(头部)的顺序返回。返回的迭代器是“弱一致”迭代器。
语法:
Iterator descendingIterator()
参数:此方法不接受任何参数。
返回值:这个方法返回一个迭代器，以适当的顺序遍历这个对象中的元素
下面的程序说明了 Java 中的dependingiterator()方法:
程序一:借助 链接列表 。
// Java code to illustrate descendingIterator()
// method of Deque in Java
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Deque
Deque<String> de_que = new LinkedList<String>();
// Use add() method to add elements into the Queue
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Call iterator() method of deque
Iterator iteratorVals = de_que.iterator();
// Print elements of iterator
// created from PriorityBlockingQueue
System.out.println("The iterator values"
+ " of deque are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
输出:
The iterator values of deque are:
Welcome
To
Geeks
4
Geeks
程序二:
// Java code to illustrate descendingIterator()
// method of Deque in Java
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Deque
Deque<Integer> de_que = new LinkedList<Integer>();
// Use add() method to add elements into the Queue
de_que.add(10);
de_que.add(15);
de_que.add(30);
de_que.add(20);
de_que.add(5);
// Call iterator() method of deque
Iterator iteratorVals = de_que.iterator();
// Print elements of iterator
// created from PriorityBlockingQueue
System.out.println("The iterator values"
+ " of deque are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
输出:
The iterator values of deque are:
10
15
30
20
5
节目 3: 借助 ArrayDeque 。
// Java code to illustrate descendingIterator()
// method of Deque in Java
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Deque
Deque<String> de_que = new ArrayDeque<String>();
// Use add() method to add elements into the Queue
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Call iterator() method of deque
Iterator iteratorVals = de_que.iterator();
// Print elements of iterator
// created from PriorityBlockingQueue
System.out.println("The iterator values"
+ " of deque are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
输出:
The iterator values of deque are:
Welcome
To
Geeks
4
Geeks
程序 4: 在的帮助下链接锁定程序。
// Java code to illustrate descendingIterator()
// method of Deque in Java
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
public class GFG {
public static void main(String args[])
{
// Creating an empty Deque
Deque<String> de_que = new LinkedBlockingDeque<String>();
// Use add() method to add elements into the Queue
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Call iterator() method of deque
Iterator iteratorVals = de_que.iterator();
// Print elements of iterator
// created from PriorityBlockingQueue
System.out.println("The iterator values"
+ " of deque are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
输出:
The iterator values of deque are:
Welcome
To
Geeks
4
Geeks
方案五:在的配合下。
// Java code to illustrate descendingIterator()
// method of Deque in Java
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
public class GFG {
public static void main(String args[])
{
// Creating an empty Deque
Deque<String> de_que = new ConcurrentLinkedDeque<String>();
// Use add() method to add elements into the Queue
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Call iterator() method of deque
Iterator iteratorVals = de_que.iterator();
// Print elements of iterator
// created from PriorityBlockingQueue
System.out.println("The iterator values"
+ " of deque are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
输出:
The iterator values of deque are:
Welcome
To
Geeks
4
Geeks
参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/Dequee . html # DecendingTerrar–
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