How to draw rectangular in J2ME by canvas through drawline method - java-me

Question

This is first time I at a question in here.
Im new in J2ME, and now im developing a small application, but i get problem when i wanna show data into table. But in J2me not support table there for that i know another way can represent for table such as create table by Canvas or CustomItem.
In Canvas i can draw 2 lines something like:
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|
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but i dont know how can get coordinate of 2 lines remain such as like:
|
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|
|
|
--------------------------
two draw a rectangular in whole screen,
i know drawline method has 4 factors x1,y1,x2,y2.
but i can not calculate x point and y point to draw two lines above
I need you help me explain or give me example
My Code:
package test;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
/**
*
* #author J2MENewBie
*/
public class TableCanvasExample extends Canvas {
private int cols=3;
private int rows =50;
protected void paint(Graphics g) {
g.setColor(0x94b2ff);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
//draw two lines
g.setColor(0xf8011e);
g.drawLine(0, 0, 0, this.getWidth());
g.drawLine(0, 0, this.getHeight(), 0);
}
}
package test;
import javax.microedition.lcdui.Display;
import javax.microedition.midlet.*;
/**
* #author J2ME NewBie
*/
public class TableCanvasMidlet extends MIDlet {
private TableCanvasExample tbcve;
public TableCanvasMidlet(){
tbcve = new TableCanvasExample();
}
public void startApp() {
Display.getDisplay(this).setCurrent(tbcve);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}
P/s: the vertical line doesn't full size i dont know why ???
Thank you!

Answer 1

too much same-looking zeroes in your code - try using descriptive names instead:
int w = getWidth(), h = getHeight(); // I think this way it's easier to read
int xLeft = 0, yTop = 0; // descriptive names for zeroes
// below, replace w - 1 -> w and h - 1 -> h if lines drawn are off-by-one
int xRight = w - 1, yBottom = h - 1; // names for top - right coordinates
g.drawLine(xLeft, yTop, xLeft, yBottom); // your left vertical
g.drawLine(xLeft, yTop, xRight, yTop); // your top horizontal
g.drawLine(xRight, yTop, xRight, yBottom); // add right vertical
g.drawLine(xLeft, yBottom, xRight, yBottom); // add bottom horizontal
if rectangle drawn doesn't look like you expect find where there is wrong semantic in code above