My program complied nicely but there is error when running

[ryanlcc]

I am using netbean 6.8 and has not problem compiling...somehow, once start, it gives me this error..

Not able to submit breakpoint MethodBreakpoint [Calculator].jblnit '()Lvoid;', reason: Method 'jblnit' with signature '()Lvoid;' does not exist in class Calculator.

below are my code..



import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.ChoiceGroup;

public class Calculator extends MIDlet implements CommandListener{

private StringItem st, output;
private Command exit = new Command("Exit", Command.EXIT,0);
private Command menu = new Command("Menu", Command.SCREEN,1);
private int answer=0, x1, x2;
private TextField input1, input2;
private String ope[] = new String[]{"+", "-", "*", "/"};
private ChoiceGroup ch = new ChoiceGroup("Select operation:",ChoiceGroup.EXCLUSIVE,ope,null);


public void startApp() {
Form mycalculator = new Form("Welcome to 'My Calculator'");

Alert alertmsg = new Alert("WELCOME", "ENJOY USNG THIS CALCULATOR",null,AlertType.CONFIRMATION);

st = new StringItem(null,"Welcome ! This calculator allows you to do addition(+),substraction(-), multiplication(*) and division(/)");

input1 = new TextField("Enter your first number :","",15,TextField.NUMERIC);
input2 = new TextField("Enter your second number :","",15,TextField.NUMERIC);

mycalculator.append(st);
Display.getDisplay(this).setCurrentItem(st);

mycalculator.append(input1);
mycalculator.append(ch);
mycalculator.append(input2);
mycalculator.append(output);
alertmsg.setTimeout(Alert.FOREVER);

mycalculator.addCommand(exit);
mycalculator.addCommand(menu);
mycalculator.setCommandListener(this);


}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable d){

if(c == menu){

x1=Integer.parseInt(input1.getString());
x2=Integer.parseInt(input2.getString());
int operation = ch.getSelectedIndex();

switch(operation){
case 0: answer = x1 + x2;
output.setText("Answer = "+answer);
break;
case 1: answer = x1 - x2;
output.setText("Answer = "+answer);
break;
case 2: answer = x1 * x2;
output.setText("Answer = "+answer);
break;
case 3: answer = x1 / x2;
output.setText("Answer = "+answer);
break;
}

}
}
}

[Norm]

Method 'jblnit'

Where is this method defined? The JVM can't find it to call it.

[ryanlcc]

Very sorry...I am still newbie here..Perhaps, a noob...

is it

public jblnit() {
}

[JosAH]

reason: Method 'jblnit' with signature '()Lvoid;' does not exist in class Calculator.

Chinese is not your native language is it? Good, because the message above is not in Chinese. What part of it didn't you understand and what caused it that you blindly dumped your code in here? Did it ever occur to you that reading (parts of) a manual might help?

kind regards,

Jos

[Norm]

is it

public jblnit() {
}

You'll have to read the API doc to see how and where that method is used for.
Your code shows the syntax for a constructor not a method.

[ryanlcc]

i have corrected my code but still giving the same problem...
with the error message
Attaching to localhost:56070
Not able to submit breakpoint FieldBreakpoint MyCalculator.cg, reason: The target VM does not support field access breakpoints.
Not able to submit breakpoint FieldBreakpoint MyCalculator.ope, reason: The target VM does not support field access breakpoints.


/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.CommandListener;
/**
* @author RyanLCC
*/
public class Midlet_1 extends MIDlet implements CommandListener{

private Display d;
private Form mycalculator;
private StringItem st, output;
private Command exit = new Command("Exit", Command.EXIT,0);
private Command menu = new Command("Menu", Command.SCREEN,1);
private int answer=0, x1, x2;
private TextField input1, input2;
private String ope[] = new String[]{"+", "-", "*", "/"};
private ChoiceGroup ch = new ChoiceGroup("Select operation:",ChoiceGroup.EXCLUSIVE,ope,null);


public Midlet_1(){
mycalculator = new Form("Welcome to 'My Calculator'");

Alert alertmsg = new Alert("WELCOME", "ENJOY USNG THIS CALCULATOR",null,AlertType.CONFIRMATION);

st = new StringItem(null,"Welcome ! This calculator allows you to do addition(+),substraction(-), multiplication(*) and division(/)");

input1 = new TextField("Enter your first number :","",15,TextField.NUMERIC);
input2 = new TextField("Enter your second number :","",15,TextField.NUMERIC);

mycalculator.append(st);
mycalculator.append(input1);
mycalculator.append(ch);
mycalculator.append(input2);
mycalculator.append(output);
alertmsg.setTimeout(Alert.FOREVER);

mycalculator.addCommand(exit);
mycalculator.addCommand(menu);
mycalculator.setCommandListener(this);

}

public void startApp() {
d= Display.getDisplay(this);
d.setCurrent(mycalculator);

}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable d){

if(c == menu){

x1=Integer.parseInt(input1.getString());
x2=Integer.parseInt(input2.getString());
int operation = ch.getSelectedIndex();

switch(operation){
case 0: answer = x1 + x2;
output.setText("Answer = "+answer);
break;
case 1: answer = x1 - x2;
output.setText("Answer = "+answer);
break;
case 2: answer = x1 * x2;
output.setText("Answer = "+answer);
break;
case 3: answer = x1 / x2;
output.setText("Answer = "+answer);
break;
}

}
}
}

[Norm]

I guess its time to read the doc for the environment that you are trying to run this code in.