JAVA: Easy Java Programming for Beginners, Your Step-By-Step Guide to Learning Java Programming (2015)

Practice Exercises

Exercise #1:

Write a program that will display every command-line argument and the total number of arguments.

CLUE: Use an array variable named length to determine the length of the array.

Exercise #2:

Write a program that will round off a series of ten random numbers from 0 to 100. Round each one of them, then display the result to the screen. Take note of the following:

· Create a class and a main() method for the calculation.

· Use the for loop statement.

· Use the Math.random() to generate the ten random numbers. To get a number between 0 to 100, simply multiply the random number by 100.

· Round the number using the Math.round() method. Rounding off is necessary because the random() method always returns a value less than 1.0.

· Display the rounded number to the screen.

Exercise #3:

Write a program that will create a new Parent class under a main Family class. The objective is also to display the line of text “What a wonderful day!” on the screen.

Practice Exercises Answers

Answer for Exercise #1:

public class MainPractice {

public static void main (String [] args) {

for (int i = 0; i < args.length; i++) {

System.out.println(args[i]);

}

System.out.print("Total Words: " + args.length);

}

}

Answer for Exercise #2:

public class MathRandomRound {

public static void main (String [] argh) {

for (int i = 0; i < 10; i++) {

double num = Math.random() * 100;

System.out.print("The number " + num);

System.out.println(" rounds to " + Math.round(num));

}

}

}

Answer for Exercise #3:

class Parent {

}

public class Family {

public static void main(String[] args) {

System.out.println("What a wonderful day!");

Parent parent = new Parent();

}

}