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  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. 		while(deque.iterator().hasNext())
  40. 		{
  41. 			System.out.print(deque.iterator().next()+" ");
  42. 		}
  43. 	}
  44.  
  45. 	public static void main(String[] args) {
  46. 		// TODO Auto-generated method stub
  47. 		Scanner scanner=new Scanner(System.in);
  48. 		Stack stack=new Stack(5);
  49.  
  50. 		while(true)
  51. 		{
  52. 			System.out.println("請輸入push、pop、peek、query任一");
  53. 			switch(scanner.nextLine())
  54. 			{
  55. 				case "push":
  56. 					if(stack.push(new String(scanner.nextLine())))
  57. 					{
  58. 						System.out.println("push一個物件");
  59. 					}else
  60. 					{
  61. 						System.out.println("push失敗");
  62. 					}
  63. 					break;
  64. 				case "pop":
  65. 					System.out.println(stack.pop());
  66. 					break;
  67. 				case "peek":
  68. 					System.out.println(stack.peek());
  69. 					break;
  70. 				case "size":
  71. 					System.out.println(stack.size());
  72. 				case "query":
  73. 					stack.query();
  74. 					break;
  75. 			}
  76. 		}
  77. 	}
  78. }
  79.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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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
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Standard output is empty
https://ideone.com/WbWy7n
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

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