Question

一道java题，求大神帮忙做一下

Answer 1

定义的接口
public interface StackInterface {
void push(Object value);
Object pop();
boolean isEmpty();
}

实现类:
public class StackImplement implements StackInterface{
private Vector<Object> vector;
public StackImplement(){
this.vector = new Vector<Object>();
}
@Override
public boolean isEmpty() {
return vector.isEmpty();
}
@Override
public Object pop() {
Object obj;
int len = vector.size();

if(len==0){
throw new EmptyStackException();
}
obj = vector.elementAt(len-1);
vector.removeElementAt(len - 1);
return obj;
}
@Override
public void push(Object value) {
vector.addElement(value);
}
}

Stack的底层就是类似实现的！望参考！