Stack的创建实例以及字符串倒叙的java实现

 1 public class Stack {
 2     
 3     public static void main(String args[])
 4     {
 5         ArrayTest1 arr = new ArrayTest1(10);
 6         
 7         
 8         arr.push(8);
 9         arr.push(7);
10         arr.push(6);
11         arr.push(5);
12         
13         while(!arr.isEmpty())
14         {
15             System.out.print(arr.pop()+" ");
16         }
17     }
18 }
19 class ArrayTest1
20 {
21     private int maxsize;
22     private long[] a;
23     private int top;
24     
25     public ArrayTest1(int maxsize)
26     {
27         this.maxsize = maxsize;
28         a = new long[this.maxsize];
29         top = -1;
30     }
31     
32     public void push(long value)
33     {
34         a[++top] = value;
35     }
36     
37     public long pop()
38     {
39         return a[top--];
40     }
41     
42     public boolean isEmpty()
43     {
44         return (top==-1);
45     }
46     
47     public boolean isFull()
48     {
49         return (top==maxsize-1);
50     }
51     
52     public long peek()
53     {
54         return a[top];
55     }
56 }

  1 import java.io.BufferedReader;
  2 import java.io.IOException;
  3 import java.io.InputStreamReader;
  4 
  5 import org.junit.Test;
  6 
  7 public class Reverse {
  8     private String input;
  9     private String output;
 10     public Reverse(String in)
 11     {
 12         input = in;
 13     }
 14     
 15     public String doRev()
 16     {
 17         int stackSize = input.length();
 18         StackX theStack = new StackX(stackSize);
 19         
 20         for(int j=0;j<input.length();j++)
 21         {
 22             char ch = input.charAt(j);
 23             theStack.push(ch);
 24         }
 25         output="";
 26         while(!theStack.isEmpty())
 27         {
 28             char ch = (char) theStack.pop();
 29             output = output+ch;
 30         }
 31         return output;
 32     }
 33 }
 34 
 35 
 36 class ReverseApp
 37 {
 38     @Test
 39     public static void main(String args[]) throws IOException
 40     {
 41         String input,output;
 42         while(true)
 43         {
 44             System.out.print("enter a string:");
 45             //flush();是流式输入输出常用的一个方法，表示强制请求清空缓冲区，
 46             //让i/o系统立马完成它应该完成的输入、输出动作。
 47             System.out.flush();
 48             input = getString();
 49             if(input.equals(""))
 50                 break;
 51             Reverse theReverser = new Reverse(input);
 52             output = theReverser.doRev();
 53             System.out.println("Reversed:"+output);
 54         }
 55     }
 56     
 57     public static String getString() throws IOException
 58     {
 59         InputStreamReader isr = new InputStreamReader(System.in);
 60         BufferedReader br = new BufferedReader(isr);
 61         String s = br.readLine();
 62         return s;
 63     }
 64     
 65 }
 66 
 67 class StackX1
 68 {
 69     private int maxsize;
 70     private char[] stackArray;
 71     private int top;
 72     
 73     public StackX1(int maxsize)
 74     {
 75         this.maxsize = maxsize;
 76         stackArray = new char[this.maxsize];
 77         top = -1;
 78     }
 79     
 80     public void push(char a)
 81     {
 82         stackArray[++top] = a;
 83     }
 84     
 85     public char pop()
 86     {
 87         return stackArray[top--];
 88     }
 89     
 90     public boolean isEmpty()
 91     {
 92         return (top==-1);
 93     }
 94     
 95     public char peek()
 96     {
 97         return stackArray[top];
 98     }
 99     
100     public boolean isFull()
101     {
102         return (top==maxsize);
103     }
104 }