Java by API/java.util/Stack

new Stack()

   <source lang="java">

/*

* Output:
* 

stack: [] push(42) stack: [42] pop -> 42 stack: [] empty stack

*  
*/

import java.util.Stack; import java.util.EmptyStackException; public class MainClass {

 public static void main(String args[]) {
   Stack st = new Stack();
   System.out.println("stack: " + st);
   st.push(new Integer(42));
   System.out.println("push(" + 42 + ")");
   System.out.println("stack: " + st);
   System.out.print("pop -> ");
   Integer a = (Integer) st.pop();
   System.out.println(a);
   System.out.println("stack: " + st);
   try {
     st.pop();
   } catch (EmptyStackException e) {
     System.out.println("empty stack");
   }
 }

}

 </source>
   
  
 
  

new Stack < E > ()

   <source lang="java">

/**

*Output: 

stack: [] push(2) stack: [2] push(6) stack: [2, 6] push(9) stack: [2, 6, 9] pop -> 9 stack: [2, 6] pop -> 6 stack: [2]

• /

import java.util.EmptyStackException; import java.util.Stack;

public class MainClass {

 static void showpush(Stack<Integer> st, int a) { 
   st.push(a); 
   System.out.println("push(" + a + ")"); 
   System.out.println("stack: " + st); 
 } 

 static void showpop(Stack<Integer> st) { 
   System.out.print("pop -> "); 
   Integer a = st.pop(); 
   System.out.println(a); 
   System.out.println("stack: " + st); 
 } 

 public static void main(String args[]) { 
   Stack<Integer> st = new Stack<Integer>(); 

   System.out.println("stack: " + st); 
   showpush(st, 2); 
   showpush(st, 6); 
   showpush(st, 9); 
   showpop(st); 

   try { 
     showpop(st); 
   } catch (EmptyStackException e) { 
     System.out.println("empty stack"); 
   } 
 } 

}

 </source>
   
  
 
  

Stack: empty()

   <source lang="java">

import java.util.Stack; public class Main {

 public static void main (String args[]) {
   Stack<String> s = new Stack<String>();
   s.push("A");
   s.push("B");
   s.push("C");
   System.out.println(s.pop());
   System.out.println(s.empty());
 }

}

 </source>
   
  
 
  

Stack: peek()

   <source lang="java">

import java.util.Stack; public class Main {

 public static void main (String args[]) {
   Stack<String> s = new Stack<String>();
   s.push("A");
   s.push("B");
   s.push("C");
   System.out.println("Next: " + s.peek());
 }

}

 </source>
   
  
 
  

Stack: pop()

   <source lang="java">

/*

* Output:
* 

stack: [] push(42) stack: [42] pop -> 42 stack: [] empty stack

*  
*/

import java.util.Stack; import java.util.EmptyStackException; public class MainClass {

 public static void main(String args[]) {
   Stack st = new Stack();
   System.out.println("stack: " + st);
   st.push(new Integer(42));
   System.out.println("push(" + 42 + ")");
   System.out.println("stack: " + st);
   System.out.print("pop -> ");
   Integer a = (Integer) st.pop();
   System.out.println(a);
   System.out.println("stack: " + st);
   try {
     st.pop();
   } catch (EmptyStackException e) {
     System.out.println("empty stack");
   }
 }

}

 </source>
   
  
 
  

Stack: push(E item)

   <source lang="java">

/*

* Output:
* 

stack: [] push(42) stack: [42] pop -> 42 stack: [] empty stack

*  
*/

import java.util.Stack; import java.util.EmptyStackException; public class MainClass {

 public static void main(String args[]) {
   Stack st = new Stack();
   System.out.println("stack: " + st);
   st.push(new Integer(42));
   System.out.println("push(" + 42 + ")");
   System.out.println("stack: " + st);
   System.out.print("pop -> ");
   Integer a = (Integer) st.pop();
   System.out.println(a);
   System.out.println("stack: " + st);
   try {
     st.pop();
   } catch (EmptyStackException e) {
     System.out.println("empty stack");
   }
 }

}

 </source>
   
  
 
  

Stack: search(Object o)

   <source lang="java">

import java.util.Stack; public class Main {

 public static void main (String args[]) {
   Stack<String> s = new Stack<String>();
   s.push("A");
   s.push("B");
   s.push("C");
   System.out.println("Next: " + s.peek());
   s.push("D");
   System.out.println(s.pop());
   s.push("E");
   s.push("F");
   int count = s.search("E");
   while (count != -1 && count > 1) {
     s.pop();
     count--;
   }
   System.out.println(s);
 }

}

 </source>