canv.java

这是一个用J2ME开发的计算器程序

package Calc;

import java.io.*;
import java.lang.*;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class Canv extends Canvas implements Runnable {
    private Display display;
    private CommandListener listener;
    private Thread othread, mythread;
    private int nthrd;
    private boolean paintAll = true;

    private KeyPaint keypaint;

    public Canv() {
        keypaint = new KeyPaint(getWidth(), getHeight());
    }


    protected void keyRepeated(int k) { }
    protected void keyReleased(int k) { }
    protected void pointerPressed(int i, int j) { }

    protected void keyPressed(int k) {
        keypaint.setPressedKey(k, getGameAction(k));
        paintAll(true);
	}

    //public void setCommandListener(CommandListener l) {
	//    super.setCommandListener(l);
    //    listener = l;
    //}

    protected void showNotify() {
	    othread = new Thread(this);
	    othread.start();
    }

    protected void hideNotify() {
	    othread = null;
    }

    public void destroy() {
        hideNotify();       //stop run()
    }

    private final String int2str(int i2) {
        if(i2 >= 10)
            {return ""  + i2;}
        else
            {return "0" + i2;}
    }

    public void setLeftRight() {
        keypaint.setCurrentPad(2);  //表明将另外一个设为活动的
        paintAll(true);
    }

    public void setRight(int right) {
        keypaint.setRightPad(right);    //向后变一个，-1向前变一个
        paintAll(true);
    }

    public void run() {
	    //Graphics g = getGraphics(); // Of the buffered screen image
        //mythread = Thread.curPadrentThread();
        //if (mythread == othread) { }
        nthrd = 1;
        while (nthrd > 0) {
		    try {
    		    mythread.sleep(5000);
    		    //paintAll(true);
		        //nthrd++;
		    } catch (java.lang.InterruptedException e) { nthrd = -1;}
        }
	    othread = null;
    }

    private void paintAll(boolean tr) {
        paintAll = tr;
        repaint();
    }

    public void paint(Graphics g) {
        if (!paintAll) {return;}

        //g.setColor(0xff0000);
        //g.fillRect(0, 0, getWidth(), getHeight());

        keypaint.paintAll(g, paintAll);

    }



}