mystack.java

CMM编译器词法分析及语法分析代码

package try_sw;
import java.util.*;

public class Mystack {

	/**
	 * @param args
	 */
	
	private Stack<String> strstack = new Stack<String>();
	private Stack<Integer> intstack = new Stack<Integer>();
	 
	private Iterator<String> i ;
	private Iterator<Integer> b ;
	
	public void push(String str,int type){
		strstack.push(str);
		intstack.push(type);
		
	}
	public void makei(){
		Iterator<String> i =strstack.iterator();
		Iterator<Integer> b = intstack.iterator();
		this.i=i;
		this.b=b;
	}
	public void pop(){
		
		strstack.pop();
		
		intstack.pop();
		
	}
	
	public String[] top(){
		
		String [] strout=new String[2];
		
		strout[0]= strstack.peek();
		strout[1]= intstack.peek().toString();
		
		return strout;
		
	}
	public String print(){
		
		Iterator<String> i =strstack.iterator();
		Iterator<Integer> b = intstack.iterator();
		
		String out="";
		
		while(i.hasNext()){
			
			out+= i.next()+" ";
			out+= b.next().toString()+" "+"\r\n";
			//System.out.print(i.next()+" ");
			//System.out.println(b.next());
		}
		
		return out;
		
	}
	
	public String[] next(){
		
		String[] out = new String[2];
		
		out[0]= i.next();
		out[1]= b.next().toString();
		
		return out;
		
		
	}
	
	
	
	public int length(){
		
		return strstack.size();
	}
	
	
	public void clear(){
		
		strstack.clear();
		intstack.clear();
		
	}
	
	public boolean empty(){
		
		return strstack.empty();
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
      Mystack mys = new Mystack();
      mys.push("k", 1);
        mys.push("l",	 2);
        
          mys.makei();
                
          String[] what = mys.next();
          for(String c:what)
        System.out.println(c);
          what = mys.next();
          for(String c:what)
        System.out.println(c);
          
          
	}

}