?? arraystack.java
字號:
package stack;
public class ArrayStack implements Stack
{
private int top=-1;
private Object[] stack;
public class FullStackException extends RuntimeException{
/**
*
*/
private static final long serialVersionUID = -907728676469025250L;}
public ArrayStack(int maxElements){stack=new Object[maxElements];}
public boolean isEmpty(){return top==-1;}
public Object peek()
{
if (top<0)throw new java.util.EmptyStackException();
return stack[top];
}
public void push(Object o)
{
if (top==stack.length-1)throw new FullStackException();
stack[++top]=o;
}
public Object pop()
{
if (top<0)throw new java.util.EmptyStackException();
return stack[top--];
}
public Object getNext()
{
if(isEmpty())throw new java.util.EmptyStackException();
else return stack[top--];
}
public int getLength()
{
return top;
}
}
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