This chapter is from the book
This chapter is from the book
This chapter is from the book
Exercises
Solutions to selected exercises can be found in the electronic document The Thinking in Java Annotated Solution Guide, available for a small fee from www.BruceEckel.com.
There are two expressions in the section labeled “precedence” early in this chapter. Put these expressions into a program and demonstrate that they produce different results.
Put the methods ternary( ) and alternative( ) into a working program.
From the sections labeled “if-else” and “return,” modify the two test( ) methods so that testval is tested to see if it is within the range between (and including) the arguments begin and end.
Write a program that prints values from 1 to 100.
Modify Exercise 4 so that the program exits by using the break keyword at value 47. Try using return instead.
Write a method that takes two String arguments and uses all the boolean comparisons to compare the two Strings and print the results. For the == and !=, also perform the equals( ) test. In main( ), call your method with some different String objects.
Write a program that generates 25 random int values. For each value, use an if-else statement to classify it as greater than, less than, or equal to a second randomly-generated value.
Modify Exercise 7 so that your code is surrounded by an “infinite” while loop. It will then run until you interrupt it from the keyboard (typically by pressing Control-C).
Write a program that uses two nested for loops and the modulus operator (%) to detect and print prime numbers (integral numbers that are not evenly divisible by any other numbers except for themselves and 1).
Create a switch statement that prints a message for each case, and put the switch inside a for loop that tries each case. Put a break after each case and test it, then remove the breaks and see what happens.