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Java Java Objects (Retired) Harnessing the Power of Objects Throwing Exceptions

Nancy Melucci
PLUS
Nancy Melucci
Courses Plus Student 36,158 Points
Posted by Nancy Melucci
Nancy Melucci
Courses Plus Student 36,158 Points

Can't find the right place to put the try/catch. So many compiler errors.

I've sailed through this part of the track until this point, and I completely understand how try/catch works but I cannot find the place to insert the code for it without causing a total meltdown to the autograder with sometimes nearly 20 errors generated. If someone could please help. I've already mutilated my original code in a vain attempt to understand what is required. So I apologize for the amateurish errors. The messages are hard to interpret and you can't look at your code and read them at the same time....

public class GoKart {
  public static final int MAX_BARS = 8;
  private String mColor;
  private int mBarsCount;

  public GoKart(String color) {
    mColor = color;
    mBarsCount = 0;
  }

  public String getColor() {
    return mColor;
  }

  public void drive() {
    drive(1);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;

    try{
    drive(9);
    }catch(IllegalArgumentException iae){
      System.out.println("Not enough battery remains.");
      System.out.printf("The error was: %s\n", iae.getMessage());
  }



  public void charge(); {
    while (!isFullyCharged()) {
      mBarsCount++;
    }


  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }

}
GoKart.java 
public class GoKart {
  public static final int MAX_BARS = 8;
  private String mColor;
  private int mBarsCount;

  public GoKart(String color) {
    mColor = color;
    mBarsCount = 0;
  }

  public String getColor() {
    return mColor;
  }

  public void drive() {
    drive(1);
  }

  public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;

    try{
    drive(9);
    }catch(IllegalArgumentException iae){
      System.out.println("Not enough battery remains.");
      System.out.printf("The error was: %s\n", iae.getMessage());
  }



  public void charge(); {
    while (!isFullyCharged()) {
      mBarsCount++;
    }


  public boolean isBatteryEmpty() {
    return mBarsCount == 0;
  }

  public boolean isFullyCharged() {
    return mBarsCount == MAX_BARS;
  }

}

2 Answers

ISAIAH S
ISAIAH S
1,409 Points

You don't need try\catch all you need to do is change:

public void drive(int laps) {
    // Other driving code omitted for clarity purposes
    mBarsCount -= laps;

    try{
    drive(9);
    }catch(IllegalArgumentException iae){
      System.out.println("Not enough battery remains.");
      System.out.printf("The error was: %s\n", iae.getMessage());
  }

To:

public void drive(int laps) {
    int newBarsCount = mBarsCount - laps;
    if(newBarsCount < MAX_BARS){
      throw new IllegalArgumentException("Not enought battery remains");
    }
  }
ISAIAH S
ISAIAH S
1,409 Points

Always happy to help!!