fork download 
  1. package chapter8;
  2. import java.util.*;
  3. public class Stack {
  4.  
  5.     private Deque deque=new ArrayDeque();
  6. 	private int capacity;
  7.  
  8. 	public Stack(int capacity)
  9. 	{
  10. 		this.capacity=capacity;
  11. 	}
  12.  
  13. 	public boolean push(Object o)
  14. 	{
  15. 		if(deque.size()+1>capacity)
  16. 		{
  17. 			return false;
  18. 		}
  19. 		return deque.offerLast(o);
  20. 	}
  21.  
  22. 	public Object pop()
  23. 	{
  24. 		return deque.pollLast();
  25. 	}
  26.  
  27. 	public Object peek()
  28. 	{
  29. 		return deque.peekLast();
  30. 	}
  31.  
  32. 	public int size()
  33. 	{
  34. 		return deque.size();
  35. 	}
  36.  
  37. 	public void query()
  38. 	{
  39. 		Iterator iterator=deque.iterator();
  40. 		while(iterator.hasNext())
  41. 		{
  42. 			System.out.print(iterator.next()+" ");
  43. 		}
  44. 	}
  45.  
  46. 	public static void main(String[] args) {
  47. 		// TODO Auto-generated method stub
  48. 		Scanner scanner=new Scanner(System.in);
  49. 		Stack stack=new Stack(5);
  50.  
  51. 		while(true)
  52. 		{
  53. 			System.out.println("請輸入push、pop、peek、query任一");
  54. 			switch(scanner.nextLine())
  55. 			{
  56. 				case "push":
  57. 					if(stack.push(new String(scanner.nextLine())))
  58. 					{
  59. 						System.out.println("push一個物件");
  60. 					}else
  61. 					{
  62. 						System.out.println("push失敗");
  63. 					}
  64. 					break;
  65. 				case "pop":
  66. 					System.out.println(stack.pop());
  67. 					break;
  68. 				case "peek":
  69. 					System.out.println(stack.peek());
  70. 					break;
  71. 				case "size":
  72. 					System.out.println(stack.size());
  73. 				case "query":
  74. 					stack.query();
  75. 					break;
  76. 			}
  77. 		}
  78. 	}
  79. }
  80.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:3: error: class Stack is public, should be declared in a file named Stack.java
public class Stack {
       ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
stdout 
Standard output is empty
https://ideone.com/OzwJFS
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!