cal.java

这是一个关于java面板的程序样例

package frame;
import java.awt.*;
import java.awt.event.ActionListener;

import javax.swing.*;
public class Cal extends JFrame {
	  String title;
	  int with;
	  int length;
	  Model model;
	  boolean clear; 
	  JTextField txt=new JTextField(20);
          JMenuBar  mb=new JMenuBar();	  
	  Cal(String title,int with,int length,Model model){
		  super(title);		 
		  this.model=model;
		  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  this.setSize(with,length);		 
		  this.add(txt,BorderLayout.NORTH);
		  initButton();
		  initMenu();
		  this.pack();
		  
	  }	  	  
	public Model getModel() {
		return model;
	}
	public String getTxt() {
		 return txt.getText();
	}
	public void  clearTxt() {
		 txt.setText("");
	}	
	public void setTxt(String txt) {
		StringBuffer sbf=new StringBuffer(this.txt.getText());
		if(this.clear==false)
		{sbf.append(txt);
		 this.txt.setText(sbf.toString());
		}
		else{ 
			this.txt.setText(txt);
			this.clear=false;
		}
	}
	private void initMenu(){		  
		  JMenu mb1=new JMenu("编辑");
		  JMenu mb2=new JMenu("查看");
		  JMenu mb3=new JMenu("帮助");
		 
		  mb.add(mb1);
		  mb.add(mb2);
		  mb.add(mb3);
		  this.setJMenuBar(mb);		  	  
	  }
	  private void initButton(){
		 String a []={"0","1","2","3","4","5","6","7","8","9"};
		  JPanel cpa=new JPanel(new GridLayout(0,4));
		  ButtonListener b=new ButtonListener(this,model);
		  b.registerModel(model);
		  JButton MC=new JButton("MC");
		  MC.addActionListener(b);
		  cpa.add(MC);
		  JButton MR=new JButton("MR");
		  MR.addActionListener(b);
		  cpa.add(MR);
		  JButton MS=new JButton("MS");
		  cpa.add(MS);
		  MS.addActionListener(b);
		  JButton M=new JButton("M+");
		  M.addActionListener(b);
		  cpa.add(M);
		  for(int i=0;i<10;i++)
			  { 
			    JButton d=new JButton(a[i]);
	            cpa.add(d); 
	            d.addActionListener(b);
			  }
		  JButton E=new JButton("=");
		  JButton P=new JButton("+");
		  JButton MI=new JButton("-");
		  JButton CH=new JButton("*");
		  JButton S=new JButton("/");
		  JButton n=new JButton(".");
		  JButton zf=new JButton("+/-");
		  JButton sqrt=new JButton("sqrt");
		  JButton x=new JButton("1/x");
		  JButton bai=new JButton("%");
		  JButton Back=new JButton("Backspace");
		  JButton CE=new JButton("CE");
		  JButton C=new JButton("C");
		  E.addActionListener(b);
		  P.addActionListener(b);
		  MI.addActionListener(b);
		  CH.addActionListener(b);
		  S.addActionListener(b);
		  Back.addActionListener(b);
		  x.addActionListener(b);
		  bai.addActionListener(b);
		  CE.addActionListener(b);
		  C.addActionListener(b);
		  sqrt.addActionListener(b);
		  zf.addActionListener(b);
		  n.addActionListener(b);
		  
		  
		  cpa.add(E); 
		  cpa.add(P); 
		  cpa.add(MI); 
		  cpa.add(CH); 
		  cpa.add(S); 
		  cpa.add(CE); 
		  cpa.add(C); 
		  cpa.add(Back); 
		  cpa.add(bai); 
		  cpa.add(x); 
		  cpa.add(sqrt); 
		  cpa.add(zf); 
		  cpa.add(n); 
		  cpa.add(S	); 
		  this.add(cpa);
		  
		  
		  }
	       
    public static void main(String[] args) {
    /*	javax.swing.SwingUtilities.invokeLater(
    			   new Runnable() {
    			      public void run() {
    			         Cal app=new Cal("计算器",300,300);
    			         app.setVisible(true);
    			      }
    			   });
     }}*/	
        Model model=new Model();
        Cal cal=new Cal("计算器",300,300,model);
        cal.setVisible(true);
       
    }
}