buttonlistener.java

这是一个关于java面板的程序样例

package frame;

import java.awt.Toolkit;
import java.awt.event.*;
import java.awt.event.*;


public class ButtonListener implements ActionListener{
  
    Cal a;
    Model modle;
    
    public ButtonListener(Cal a,Model modle) {
		super();
                this.modle=modle;	
		this.a = a;
	}
    public void registerModel(Model m){
    	this.modle=m;
    	
    }
	public void actionPerformed(ActionEvent E) {
		    if(("0123456789.").indexOf(E.getActionCommand())>=0){
		    	a.setTxt(E.getActionCommand());
		    }else if(("+-*/%").indexOf(E.getActionCommand())>=0) {
	    		modle.setOperate(E.getActionCommand().charAt(0));
	    		//System.out.println(E.getActionCommand().charAt(0));
	    		String op=a.getTxt();
		    	modle.a1=Integer.parseInt(op);		    	
		    	//a.clearTxt();
		    	a.clear=true;
		    }else if(E.getActionCommand().equals("=")) {
		    	String op=a.getTxt();
		    	modle.a2=Integer.parseInt(op);
		    	a.clearTxt();
		    	a.setTxt(modle.eval());
		    	a.clear=true;}
		        
		    	
		    		
		    	
    }
		
	}