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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. /**
  7.  * Created by green on 19.12.15.
  8.  */
  9. class steck {
  10.     private int size;
  11.     private Object[] date;
  12.     private int capacity;
  13.     public steck(){
  14.         date = new Object[2];
  15.         capacity = 2;
  16.     }
  17.     public steck(int x){
  18.         date = new Object[x];;
  19.         capacity = x;
  20.     }
  21.  
  22.     public boolean isEmpty(){
  23.         return size == 0;
  24.     }
  25.  
  26.     private void resize(int x){
  27.         Object[] newDate = new Object[x];
  28.         System.arraycopy(date, 0, newDate, 0, size);
  29.         date = null;
  30.         date = newDate;
  31.     }
  32.  
  33.     public void push(Object x){
  34.         if(size == capacity){
  35.             resize(2*capacity);
  36.         }
  37.         date[size++] = x;
  38.     }
  39.  
  40.     public Object pop(){
  41.         if(isEmpty()){
  42.             return null;
  43.         }
  44.         if(size < capacity/2){
  45.             resize(capacity/2);
  46.         }
  47.         Object temp = date[size -1];
  48.         size = size -1;
  49.         return temp;
  50.     }
  51.  
  52.     public Object peek(){
  53.         if(isEmpty()) return null;
  54.         return date[size-1];
  55.     }
  56.  
  57.     public void clear(){
  58.         size = 0;
  59.     }
  60.  
  61.     public int size(){
  62.         return size;
  63.     }
  64.     public int getCapacity(){
  65.         return size;
  66.     }
  67. }
  68.  
  69. class Ideone
  70. {
  71. 	public static void main (String[] args) throws java.lang.Exception
  72. 	{
  73. 		steck test = new steck(4);
  74.         System.out.println(test.isEmpty());
  75.         test.push(12);
  76.         System.out.println(test.isEmpty());
  77.         System.out.println(test.peek());
  78.         test.push(13);
  79.         test.push(14);
  80.         test.push(15);
  81.         test.push(16);
  82.         test.push(17);
  83.         test.push('(');
  84.         System.out.println(test.size());
  85.         System.out.println(test.peek().equals('('));
  86.         test.pop();
  87.         System.out.println(test.peek());
  88.         test.pop();
  89.         System.out.println(test.peek());
  90.         test.pop();
  91.         System.out.println(test.peek());
  92.         test.pop();
  93.         System.out.println(test.peek());
  94.         test.pop();
  95.         System.out.println(test.peek());
  96.         System.out.println(test.isEmpty());
  97.         test.pop();
  98.         System.out.println(test.peek());
  99.         test.pop();
  100.         System.out.println(test.isEmpty());
  101. 	}
  102. }
Success #stdin #stdout 0.1s 320512KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
true
false
12
7
true
17
16
15
14
13
false
12
true
https://ideone.com/Qhn50G
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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