Java中的 Stack addAll(Collection) 方法示例

Stack Class的addAll(Collection)方法用于将作为参数传递给此函数的集合中的所有元素附加到 Stack 的末尾，同时记住集合迭代器的返回顺序。

句法：

boolean addAll(Collection C)

参数：该方法接受一个强制参数C ，它是 ArrayList 的集合。它是需要将元素附加到堆栈末尾的集合。

返回值：如果至少执行了一个附加操作，则该方法返回True ，否则返回False 。

下面的程序说明了Java.util.Stack.addAll() 方法：

// Java code to illustrate boolean addAll()
import java.util.*;
import java.util.ArrayList;
  
public class GFG {
    public static void main(String args[])
    {
  
        // Creating an empty Stack
        Stack stack = new Stack();
  
        // Use add() method to add elements in the Stack
        stack.add("Geeks");
        stack.add("for");
        stack.add("Geeks");
        stack.add("10");
        stack.add("20");
  
        // A collection is created
        Collection c = new ArrayList();
        c.add("A");
        c.add("Computer");
        c.add("Portal");
        c.add("for");
        c.add("Geeks");
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack);
  
        // Appending the collection to the Stack
        stack.addAll(c);
  
        // Clearing the Stack using clear() and displaying
        System.out.println("The new Stack is: " + stack);
    }
}

输出：

The Stack is: [Geeks, for, Geeks, 10, 20]
The new Stack is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]

示例 2：

// Java code to illustrate
// boolean add(Object element)
  
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 in the Stack
        stack.add(10);
        stack.add(20);
        stack.add(30);
        stack.add(40);
        stack.add(50);
  
        // A collection is created
        Collection c = new ArrayList();
        c.add(1);
        c.add(2);
        c.add(3);
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack);
  
        // Appending the collection to the Stack
        stack.addAll(c);
  
        // Clearing the Stack using clear() and displaying
        System.out.println("The new Stack is: " + stack);
    }
}

输出：

The Stack is: [10, 20, 30, 40, 50]
The new Stack is: [10, 20, 30, 40, 50, 1, 2, 3]