stack.java

Java写的部分数据结构源码

public class Stack {
    private java.util.Vector pool = new java.util.Vector();
    public Stack() {
    }
    public Stack(int n) {
        pool.ensureCapacity(n);
    }
    public void clear() {
        pool.clear();
    }
    public boolean isEmpty() {
        return pool.isEmpty();
    }
    public Object topEl() {
        return pool.lastElement();
    }
    public Object pop() {
        return pool.remove(pool.size()-1);
    }
    public void push(Object el) {
        pool.addElement(el);
    }
    public String toString() {
        return pool.toString();
    }
}