Java中的 Stack addAll(int, Collection) 方法与示例
Stack 类的addAll(int, 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堆栈的特定索引或位置。
句法:
boolean addAll(int index, Collection C)
参数:此函数接受两个参数,如上述语法所示,如下所述。
- index :此参数是整数数据类型,并指定堆栈中的位置,从容器中的元素将被插入的位置开始。
- C : 它是 ArrayList 的集合。它是需要附加其元素的集合。
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:
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 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(1, 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, 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 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(2, 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, 1, 2, 3, 30, 40, 50]