Java with BlueJ, 2016a

38 CHAPTER 2. BASICS
Some further points about the Boolean operators (not very important to us
yet):
• When && is being evaluated and if the first operand is false, then the
result must be false and so the second operand is not evaluated.
• When || is being evaluated and if the first operand is true, then the
result must be true and so the second operand is not evaluated.
other operators
• There are other operators (&, |, and^) that you may be interested
in learning about subsequent to this course. These, amongst other
features, are discussed in Java in a Nutshell [5].
Relational Operators
There are a number of operators defined for comparing one value to another.
These are summarized in the table below (assume x and y are of type int).
These operations evaluate to a boolean (true or false):
Relational operators
operator meaning example
< less than x < y
> greater than x > 5
y
== equal to x == y
!= not equal to x != 0
Note that == is the operator used to test for equality, and != is used to test
two operands to determine if they are not equal. Listing 2.7 illustrates the
use of relational operators. Later in the chapter on control structures we
will use relational operators in many examples.
Listing 2.7: Comparing char values
1 public class CompareNumber
2 {
3 public static void main(String[] args)
4 {
5 // i1 and i2 are two char variables
6 int i1 = 111;
7 int i2 = 555;
8 // Display i1 and i2