![]() Here is an example of an EmptyStackException thrown when an element is attempted to be popped from an empty stack: import java.util. Methods inherited from interface forEach, spliterator. For example, if the Stack.pop() method is used to remove an object at the top of an empty stack, an EmptyStackException is thrown. The push, pop, peek, size, and is-empty operations all take constant time in. The EmptyStackException is thrown when attempting to access elements in an empty stack in Java. Since the EmptyStackException is an unchecked exception, it does not need to be declared in the throws clause of a method or constructor. 114: elementData = null Ä¡19: * Returns the top Object on the stack without removing it.The EmptyStackException is a runtime exception in Java that is thrown by methods in the Stack class to indicate that the stack is empty. ![]() The item popped isÄ¡02: * return the Object popped from the stackÄ¡03: * throws EmptyStackException if the stack is emptyÄ¡11: T obj = elementData Ä¡12: 113: // Set topmost element to null to assist the gc in cleanup. 92: // Note: spec indicates that this method *always* returns obj passed in! 93: 94: addElement( item) Ä©9: * Pops an item from the stack and returns it. This method is effectivelyĨ4: * param item the Object to push onto the stackĨ5: * return the Object pushed onto the stackÄ©0: // When growing the Stack, use the Vector routines in case more 91: // memory is needed. Since char is a primitive datatype, which cannot be used in generics, we have to use the wrapper class of to create a Stack: Stack charStack new Stack <> () Now, we can use the push, pop, and peek methods with our Stack.67: 68: /**ħ0: */ 71: private static final long serialVersionUID = 1224463164541339165L ħ4: * This constructor creates a new Stack, initially emptyĨ1: * Pushes an Object onto the top of the stack. this 66: // often reduces out duplicate bounds checking). You can also seek forÄ¥2: * the 1-based position of an element on the stack.Ä¥4: * Warren Levy * Eric Blake * ListĦ1: */ 62: public class Stack extends VectorĦ4: // We could use Vector methods internally for the following methods, 65: // but have used Vector fields directly for efficiency (i.e. Exception: The method throws EmptyStackException if the stack is empty. Return Value: The method returns the element at the top of the Stack else returns NULL if the Stack is empty. Stack itself extends Vector and provides the additionalÄ¥1: * methods for stack manipulation (push, pop, peek). Syntax: STACK.peek () Parameters: The method does not take any parameters. Ĥ6: * Status: Believed complete and correctĤ9: * Stack provides a Last In First Out (LIFO) data type, commonly knownÄ¥0: * as a Stack. */ 39: 40: 41: package java.util Ĥ2: 43: /* Written using "Java Class Libraries", 2nd edition, ISBN 2-3Ĥ4: * "The Java Language Specification", ISBN 1-1Ĥ5: * plus online API docs for JDK 1.2 beta from. If you do not wish to do so, delete thisÄ£8:exception statement from your version. Create a new constructor for the linked -list implementation of Stack. ![]() If you modify this library, you may extendÄ£6:this exception to your version of the library, but you are notÄ£7:obligated to do so. An independent module is a module which is not derived fromÄ£5: or based on this library. Thus, the terms andÄ¢5: conditions of the GNU General Public License cover the wholeÄ¢7: 28:As a special exception, the copyright holders of this library give youÄ¢9:permission to link this library with independent modules to produce anÄ£0: executable, regardless of the license terms of these independentÄ£1:modules, and to copy and distribute the resulting executable underÄ£2:terms of your choice, provided that you also meet, for each linkedÄ£3:independent module, the terms and conditions of the license of thatÄ£4:module. If not, write to theÄ¢0: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MAÄ¢2: 23:Linking this library statically or dynamically with other modules isÄ¢4:making a combined work based on this library. Here is the call to the constructor of the Stack class, that is. As youâve probably already guessed this class represents the LIFO stack of objects. It also implements interfaces Collection, Iterable, Cloneable, Serializable. See the GNUÄ¡6:General Public License for more details.Ä¡7: 18:You should have received a copy of the GNU General Public LicenseÄ¡9:along with GNU Classpath see the file COPYING. In Java Stack Class is a class from the Collection framework that implements List interface and extends Vector class. 1: /* Stack.java - Class that provides a Last In First Out (LIFO)Ä¢: datatype, known more commonly as a StackÄ£: Copyright (C) 1998, 1999, 2001, 2004, 2005ħ: 8:GNU Classpath is free software you can redistribute it and/or modifyÄ©:it under the terms of the GNU General Public License as published byÄ¡0: the Free Software Foundation either version 2, or (at your option)Ä¡2: 13:GNU Classpath is distributed in the hope that it will be useful, butÄ¡4:WITHOUT ANY WARRANTY without even the implied warranty ofÄ¡5: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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