在Java中使用示例的Stack addAll(int, Collection)方法

Stack类的addAll(int, Collection)方法用于在Stack的特定索引或位置追加传递给此函数的集合中的所有元素。

语法：

boolean addAll(int index, Collection C)

参数: 此函数如上语法所示，接受两个参数，如下所述。

• index ：这个参数是整数类型，并指定从哪里开始在Stack中插入container中的元素。
• C ：这是一个ArrayList集合。需要追加其元素的集合。

返回值： 如果至少执行一个附加操作，则该方法返回True，否则返回False。

下面的程序说明Java.util.Stack.addAll()方法：

示例1：

// 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<String> stack = new Stack<String>();
  
        // 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<String> c = new ArrayList<String>();
        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(1, c);
  
        // Clearing the Stack using clear() and displaying
        System.out.println("The new Stack is: " + stack);
    }
}

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

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<Integer> stack
            = new Stack<Integer>();
  
        // 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<Integer> c = new ArrayList<Integer>();
        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(2, c);
  
        // Clearing the Stack using clear() and displaying
        System.out.println("The new Stack is: " + stack);
    }
}

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