我必须实现一个通用堆栈,但是当我尝试构建项目时,我遇到了一个我无法弄清楚的错误。下面的代码:通用堆栈阵列
Stack.java - >接口
package stack;
public interface Stack <T> {
public boolean isEmpty();
public boolean isFull();
public void push(T x) throws StackFullException;
public boolean offer(T x);
public T pop() throws StackEmptyException;
public T poll();
public T peek() throws StackEmptyException;
public T element();
}
StackArray.java - >接口
package stack;
public class StackArray <T extends Number> implements Stack {
static int max;
private int nr;
private T[] stack;
public StackArray(int size){
nr=0;
stack=(T[])(new Object[size]);
max=size;
}
public boolean isEmpty() {
if (nr<=0)
return true;
return false;
}
public boolean isFull() {
if (nr==max-1)
return true;
return false;
}
public void push(Object x) throws StackFullException{
if(isFull())
throw new StackFullException();
else
stack[nr++]=(T)x;
}
public boolean offer(Object x) {
if(isFull())
return false;
else
{
stack[nr++]=(T)x;
return true;
}
}
public T pop() throws StackEmptyException {
T aux=(T)(new Object());
if(isEmpty())
throw new StackEmptyException();
else
{
aux=stack[nr];
stack[nr]=null;
nr--;
return aux;
}
}
public T poll() {
T aux=(T)(new Object());
if(isEmpty())
return null;
else
{
aux=stack[nr];
stack[nr]=null;
nr--;
return aux;
}
}
public T peek() throws StackEmptyException {
if(isEmpty())
throw new StackEmptyException();
else
return stack[nr];
}
public T element() {
if(isEmpty())
return null;
else
return stack[nr];
}
}
和主类的实现:
package stack;
public class Main {
public static void main(String[] args) throws StackFullException, StackEmptyException {
StackArray stiva=new StackArray(10);
for(int i=1; i<10; i++)
stiva.push(i);
for(int i=1; i<10; i++)
System.out.print(stiva.pop()+" ");
}
}
当我尝试构建该项目时,我收到以下错误:
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Number;
at stack.StackArray.<init>(StackArray.java:10)
at stack.Main.main(Main.java:5)
Java Result: 1
任何人都可以帮助我吗?谢谢!
另一件事;似乎没有'max'为空的好理由;事实上,如果人们一次使用你的堆栈的两个实例,你的代码可能会非常灾难性地失败。 – 2011-03-14 01:59:07
您不想使用[Stack] [1]或[Deque] [2]的实现的任何特定原因? [1]:http://download.oracle.com/javase/6/docs/api/java/util/Stack.html [2]:http://download.oracle.com /javase/6/docs/api/java/util/Deque.html – 2011-03-14 01:09:59