[Djur]

There are a few things that I see in your code: empty statements (not a bad thing to have, but very superfluous) and an infinite loop (definitely a bad thing).

The code you posted looks like this; I added the comments.

Originally Posted by 2185Bilal

package bilal.eci.code.robotics;

import edu.wpi.first.wpilibj.IterativeRobot;
import edu.wpi.first.wpilibj.RobotDrive;
import edu.wpi.first.wpilibj.Jaguar;
import edu.wpi.first.wpilibj.Joystick;
import edu.wpi.first.wpilibj.Timer;


public class ExhibitionMainClass extends IterativeRobot {
    
    Jaguar leftMotor1 = new Jaguar(1);  // define the 1st left motor 
    Jaguar leftMotor2 = new Jaguar(2);  // define the 2nd left motor
    
    Jaguar rightMotor1 = new Jaguar(3); // define the 1st right motor 
    Jaguar rightMotor2 = new Jaguar(4); // define the 2nd right motor 
    
        
    RobotDrive drive = new RobotDrive (leftMotor1, leftMotor2, rightMotor1, rightMotor2);   // define the robot drive system
    
    Joystick controller = new Joystick(1);
    
    public void robotInit() { //empty method - you don't need this
        
    }

    public void autonomousInit() {
        
        for(int i=0; i<4; i++){
            drive.drive(0.5,0.0);    // drive forward at 1/2 speed
            Timer.delay(2.0);        // wait 2 sec
            drive.drive(0.0, 0.75);  // drive with 0% speed and 75% turn
            Timer.delay(0.75);       // wait for the 90 degree turn to complete
            }
    }
    
    public void autonomousContinuous() { //empty method - you don't need this
        
    }
    public void autonomousPeriodic() { //empty method - you don't need this

    }

    public void telopInit(){ //all this method does is freeze your robot - get rid of it
        while(isOperatorControl() && isEnabled()) //infinite loop = not good!
        {
           
            
        }       
    }
    
    public void telopContinuous() { //empty method - you don't need this
        
    }
    
    public void teleopPeriodic() {
         drive.tankDrive(controller, 2, controller, 5);  // drive the robot according to joystick        
    }
    
    public void disabledInit() {
        drive.drive(0.0,0.0);        
    }
    
    public void disabledPeriodic() { //empty method - you don't need this
        
    }
    
    public void disabledContinuous() { //empty method - you don't need this
        
    }
}

You have an infinite loop in teleopInit(), so your program will never progress beyond that because it is always enabled and under operator control during teleop. If you're not going to do anything with a method, leave it out entirely - this goes for the robotInit(), autonomousPeriodic(), autonomousContinuous(), teleopInit(), and teleopContinuous() methods in the code you posted.

Better code would look like this:

package bilal.eci.code.robotics;

import edu.wpi.first.wpilibj.IterativeRobot;
import edu.wpi.first.wpilibj.RobotDrive;
import edu.wpi.first.wpilibj.Jaguar;
import edu.wpi.first.wpilibj.Joystick;
import edu.wpi.first.wpilibj.Timer;

public class ExhibitionMainClass extends IterativeRobot {

    Jaguar leftMotor1   = new Jaguar(1);
    Jaguar leftMotor2   = new Jaguar(2);
    Jaguar rightMotor1 = new Jaguar(3);
    Jaguar rightMotor2 = new Jaguar(4);

    RobotDrive drive = new RobotDrive (leftMotor1, leftMotor2, rightMotor1, rightMotor2);   // define the robot drive system
    
    Joystick controller = new Joystick(1);

    public void autonomousInit() {        
        for(int i=0; i<4; i++){
                drive.drive(0.5,0.0);    //drive forward at 1/2 speed
                Timer.delay(2.0);        //wait 2 sec
                drive.drive(0.0, 0.75); //drive with 0% speed and 75% turn
                Timer.delay(0.75);      //wait for the 90 degree turn to complete
            }
    }

    public void teleopPeriodic() {
         drive.tankDrive(controller, 2, controller, 5);  // drive the robot according to joystick        
    }
    
    public void disabledInit() {
        drive.drive(0.0,0.0);        
    }

}

You may also want to declare your objects final to make it clear that you're not going to reassign new values, but that's just my personal preference.