Java Data Types Exercises – Part 3

What is type casting in Java?

Declaring a variable with a specific data type Converting a value from one data type to another

What will be the value of the roundedPi ?

                class Main {
  public static void main(String[] args) {
    double pi = 3.14159;
    int roundedPi = (int) pi;  

    System.out.println("Rounded Pi: " + roundedPi);
  }
}

3 3.0

What will be the value of the pi variable?

                class Main {
  public static void main(String[] args) {
    double pi = 3.14159;
    int roundedPi = (int) pi;  

    System.out.println("Rounded Pi: " + roundedPi);
    System.out.println("Pi: " + pi);
  }
}

3.14159 3.0

Cast the string into integer.

                class Main {
  public static void main(String[] args) {
    String resolution = "72";
    int result = ""
  }
}

parseInt . Integer (resolution) ; .

Cast the string into double

                class Main {
  public static void main(String[] args) {
    String weight = "57.5";
    double result = "".parseDouble(weight);  
  }
}

What is the output of this code?

                class Main {
  public static void main(String[] args) {
    String bankBalance = "$2500.30";
    double result = Double.parseDouble(bankBalance);

    System.out.println(result);
  }
}

It displays an error message because the bankBalance value contains non-numeric characters, making it unable to perform the casting operation It prints 2500

What is the output of this code?

                class Main {
  public static void main(String[] args) {
    String population = "1,000,000";
    double result = Integer.parseInt(population);

    System.out.println(result);
  }
}

It displays an error message because the population value contains non-numeric characters, making it unable to perform the casting operation. It prints 1000000

Debug this code.

                class Main {
  public static void main(String[] args) {
    String capacity = "102";
    int result = ""(capacity) + 5;

    System.out.println(result);
  }
}

Java Exercises for Data Types

If you’ve faced difficulties with these exercises, take a look at Data Types Module on my Java course.

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Happy Coding!
Behnam Khani

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Java Data Types Exercises – Part 3

Java Exercises for Data Types