Java中的堆栈迭代器（）方法与示例

Java.util.Stack.iterator()方法用于返回与堆栈相同元素的迭代器。元素从堆栈中的内容以随机顺序返回。

句法：

Iterator iterate_value = Stack.iterator();

参数：该函数不带任何参数。

返回值：该方法迭代堆栈的元素并返回值（迭代器）。

下面的程序说明了Java.util.Stack.iterator() 方法的使用：

示例 1：

// Java code to illustrate iterator()
  
import java.util.*;
import java.util.Stack;
  
public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack stack = new Stack();
  
        // Use add() method to add elements into the Stack
        stack.add("Welcome");
        stack.add("To");
        stack.add("Geeks");
        stack.add("4");
        stack.add("Geeks");
  
        // Displaying the Stack
        System.out.println("Stack: " + stack);
  
        // Creating an iterator
        Iterator value = stack.iterator();
  
        // Displaying the values
        // after iterating through the stack
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

输出：

Stack: [Welcome, To, Geeks, 4, Geeks]
The iterator values are: 
Welcome
To
Geeks
4
Geeks

示例 2：

// Java code to illustrate hashCode()
  
import java.util.*;
  
public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack stack
            = new Stack();
  
        // Use add() method
        // to add elements into the Stack
        stack.add(10);
        stack.add(20);
        stack.add(30);
        stack.add(40);
        stack.add(50);
  
        // Displaying the Stack
        System.out.println("Stack: " + stack);
  
        // Creating an iterator
        Iterator value = stack.iterator();
  
        // Displaying the values
        // after iterating through the stack
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

输出：

Stack: [10, 20, 30, 40, 50]
The iterator values are: 
10
20
30
40
50