Challenges

Remember the rules for this are

Try to use only the information given up to this point in this book.
Try not to give up until you've given it a solid attempt

Challenge 1.

Make an empty String array without using an empty initializer.

This means you cannot write String[] empty = {} or String[] empty = new String[] {}.

void main() {
    String[] empty = ???;

    // Should be 0
    System.out.println(empty.length);
}

Challenge 2.

What will the following code output? Change the code between the lines so it instead outputs the following.

1.0
2.0
3.0
4.0
5.0

void main() {
    Double[] prices = new Double[5];

    // ----------
    // CODE HERE
    // ----------

    for (int i = 0; i < prices.length; i++) {
        double price = prices[i];
        System.out.println(price);
    }
}

Challenge 3.

Only writing code between the lines and without reassigning the sandwich variable, make the following code output egg and cheese.

void main() {
    char[] sandwich = new char[14];

    // ----------
    // CODE HERE
    // ----------

    System.out.println(sandwich);
}

Challenge 4.

Populate the triangle array such that the code prints a right triangle that looks like the following.

*
**
***

void main() {
    char[] triangle = new char[8];

    // ----------
    // CODE HERE
    // ----------

    System.out.println(triangle);
}

Challenge 5.

Make a method named buildTriangle which returns a char[] that can be printed out to display a right triangle of any height.

You can ignore the possibility that a negative or zero height is given.

char[] buildTriangle(int height) {
    // CODE HERE
}

void main() {
    System.out.println(buildTriangle(3));
    System.out.println("--------------");
    System.out.println(buildTriangle(5));
    System.out.println("--------------");
    System.out.println(buildTriangle(2));
}

Modern Java