Compiling a simple java program with javac

Question

I need some help with compiling a simple java program using javac.

So I have these 2 files that were given to me by my teacher:

Robot.java

class Robot {

  String name;
  int numLegs;
  float powerLevel;

  Robot(String name) {
    this.name = name;
    numLegs = 2;
    powerLevel = 2.0f;
  }

  Robot() {
    this(Standard Model);
  }

  void talk(String phrase) {
    if (powerLevel = 1.0f) {
      System.out.println(name +  says  + phrase);
      powerLevel -= 1.0f;
    } else {
      System.out.println(name +  is too weak to talk.);
    }
  }

  void charge(float amount) {
    System.out.println(name +  charges.);
    powerLevel = powerLevel + amount;
  }
}

RobotWorld.java

class RobotWorld {

  public static void main (String[] args) {
    Robot c3po = new Robot("C3PO");
    c3po.talk("'Hello, Java!'");   
  }

}

When I try to compile it by typing "javac RobotWorld.java" into my command prompt, it just returns a bunch of errors. How can I fix this? I have JDK 8 installed.

And = instead of ==, and an invalid constructor. Was your assignment to fix the errors? Since it clearly contains incorrect syntax. — NickL
– NickL, Commented Jan 31, 2018 at 20:19
put double quotes around Standard Model so this("Standard Model"); — somesingsomsing
– somesingsomsing, Commented Jan 31, 2018 at 20:21
I think the purpose of the assignment was for you to figure out what is wrong with the program instead of asking for help here on SO — smac89
– smac89, Commented Jan 31, 2018 at 20:25

Sam Morehouse · Accepted Answer · 2018-01-31 20:26:50Z

3

It looks like all of the double quote characters were removed. I also added another equal sign after "powerLevel =". Try this:

class Robot {

    String name;
    int numLegs;
    float powerLevel;

    Robot(String name) {
        this.name = name;
        numLegs = 2;
        powerLevel = 2.0f;
    }

    Robot() {
        this("Standard Model");
    }

    void talk(String phrase) {
        if (powerLevel == 1.0f) {
            System.out.println(name + " says " + phrase);
            powerLevel -= 1.0f;
        } else {
            System.out.println(name + " is too weak to talk.");
        }
    }

    void charge(float amount) {
        System.out.println(name + "charges.");
        powerLevel = powerLevel + amount;
    }
}

The program output is: C3PO is too weak to talk.

edited Jan 31, 2018 at 20:26

answered Jan 31, 2018 at 20:21

Sam Morehouse

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Comments

Bemsa · Accepted Answer · 2018-01-31 20:22:46Z

1

Yes, you're missing double quotes "" for strings. Also, what does Standard Model represent?

It looks like you're intending for your default constructor to call the constructor with parameters, with a robot name of "Standard Model"?

answered Jan 31, 2018 at 20:22

Bemsa

112 bronze badges

2 Comments

MatheM Over a year ago

Looks like Standard Model is another String without quotes.

Andy Over a year ago

Putting the "" around the strings fixed it. Thanks a lot.

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