numberstack.java

来自「JAVA培训用实用代码」· Java 代码 · 共 46 行

public class NumberStack{
	private int top;
	private int[] array;
	private int size;
	
	public NumberStack(int size) {
		this.size = size;
		array = new int[size];
		top = -1;
	}

	public boolean push(int data) {
		if(top < size-1){
			array[++top] = data;
			return true;
		}
		return false;
	}
	
	public int pop() {
		if(top >= 0){
			return array[top--];
		}
		return 0;		
	}
	
	public int getTop() {
		if(top >= 0){
			return array[top];
		}
		return 0;		
		
	}
	
	public boolean isEmpty() {
		return top<0;
	}
	
	public void clear() {
		top = -1;
	}
	
	public int currentSize() {
		return top+1;
	}
}