跪求:堆栈(stack)类源代码

[qazwsx810]

谢了

[Voxer]

这个还要跪求啊，jdk带了java.util.stack

/*
* @(#)Stack.java 1.28 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/

package java.util;

/**
* The <code>Stack</code> class represents a last-in-first-out
* (LIFO) stack of objects. It extends class <tt>Vector</tt> with five
* operations that allow a vector to be treated as a stack. The usual
* <tt>push</tt> and <tt>pop</tt> operations are provided, as well as a
* method to <tt>peek</tt> at the top item on the stack, a method to test
* for whether the stack is <tt>empty</tt>, and a method to <tt>search</tt>
* the stack for an item and discover how far it is from the top.
* <p>
* When a stack is first created, it contains no items.
*
* @author Jonathan Payne
* @version 1.28, 12/19/03
* @since JDK1.0
*/
public
class Stack<E> extends Vector<E> {
/**
* Creates an empty Stack.
*/
public Stack() {
}

/**
* Pushes an item onto the top of this stack. This has exactly
* the same effect as:
* <blockquote><pre>
* addElement(item)</pre></blockquote>
*
* @param item the item to be pushed onto this stack.
* @return the <code>item</code> argument.
* @see java.util.Vector#addElement
*/
public E push(E item) {
addElement(item);

return item;
}

/**
* Removes the object at the top of this stack and returns that
* object as the value of this function.
*
* @return The object at the top of this stack (the last item
* of the <tt>Vector</tt> object).
* @exception EmptyStackException if this stack is empty.
*/
public synchronized E pop() {
E obj;
int len = size();

obj = peek();
removeElementAt(len - 1);

return obj;
}

/**
* Looks at the object at the top of this stack without removing it
* from the stack.
*
* @return the object at the top of this stack (the last item
* of the <tt>Vector</tt> object).
* @exception EmptyStackException if this stack is empty.
*/
public synchronized E peek() {
int len = size();

if (len == 0)
throw new EmptyStackException();
return elementAt(len - 1);
}

/**
* Tests if this stack is empty.
*
* @return <code>true</code> if and only if this stack contains
* no items; <code>false</code> otherwise.
*/
public boolean empty() {
return size() == 0;
}

/**
* Returns the 1-based position where an object is on this stack.
* If the object <tt>o</tt> occurs as an item in this stack, this
* method returns the distance from the top of the stack of the
* occurrence nearest the top of the stack; the topmost item on the
* stack is considered to be at distance <tt>1</tt>. The <tt>equals</tt>
* method is used to compare <tt>o</tt> to the
* items in this stack.
*
* @param o the desired object.
* @return the 1-based position from the top of the stack where
* the object is located; the return value <code>-1</code>
* indicates that the object is not on the stack.
*/
public synchronized int search(Object o) {
int i = lastIndexOf(o);

if (i >= 0) {
return size() - i;
}
return -1;
}

/** use serialVersionUID from JDK 1.0.2 for interoperability */
private static final long serialVersionUID = 1224463164541339165L;
}

[liming830902]

public class Stack {

protected int top;
protected int maxlength;
protected char[] list;

public Stack(int max){
maxlength = max;
top = -1;
list = new char[maxlength];
}

public void push(char c){
if(top<maxlength-1){
list[top] = c;
top++;
}else{
System.out.println("the stack is full");
}
}

public char pop(){
if(!isempty()){
return list[top--];
}else{
System.err.println();
return 0;
}
}


public char peek(){
return list[top];
}

public boolean isempty(){
return (top<0);
}
}

[luyang1016]

lz是不是喝多了？

[daizhenbest]

安装了jdk的src文件夹下面都是源文件。

[eric1028]

呵呵，楼主有趣！^_^