static variable lose its value
- by user542719
I have helper class with this static variable that is used for passing data between two classes.
public class Helper{
public static String paramDriveMod;//this is the static variable in first calss
}
this variable is used in following second class mathod
public void USB_HandleMessage(char []USB_RXBuffer){
int type=USB_RXBuffer[2];
MESSAGES ms=MESSAGES.values()[type];
switch(ms)
{
case READ_PARAMETER_VALUE: // read parameter values
switch(prm){
case PARAMETER_DRIVE_MODE: // paramet drive mode
Helper.paramDriveMod =(Integer.toString(((USB_RXBuffer[4]<< 8)&0xff00)));
System.out.println(Helper.paramDriveMod+"drive mode is selectd ");//here it shows the value that I need.
..........}}//let say end switch and method
and the following is an third class method use the above class method
public void buttonSwitch(int value) throws InterruptedException{
boolean bool=true;
int c=0;
int delay=(int) Math.random();
while(bool){
int param=3;
PARAMETERS prm=PARAMETERS.values()[param];
switch(value){
case 0: value=1;
while(c<5){
Thread.sleep(delay);
protocol.onSending(3,prm.PARAMETER_DRIVE_MODE.ordinal(),dataToRead,dataToRead.length);//read drive mode
System.out.println(Helper.paramDriveMod+" drive mode is ..........in wile loop");//here it shows null value
}}//let say end switch and method
what is the reason that this variable lose its value?
