can be rewritten as
var op= expression;
The compound assignment operators provide two benefits. First, they save you a bit of
typing, because they are "shorthand" for their equivalent long forms. Second, they are
implemented more efficiently by the Java run-time system than are their equivalent long
forms. For these reasons, you will often see the compound assignment operators used in
professionally written Java programs.
Here is a sample program that shows several op= assignments in action:
// Demonstrate several assignment operators.
class OpEquals {
public static void main(String args[]) {
int a = 1;
int b = 2;
int c = 3;
a += 5;
b *= 4;
c += a * b;
c %= 6;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
}
}
The output of this program is shown here:
a=6
b=8
c=3
Increment and Decrement
The ++ and the are Java's increment and decrement operators. They were introduced
in Chapter 2. Here they will be discussed in detail. As you will see, they have some special
properties that make them quite interesting. Let's begin by reviewing precisely what the
increment and decrement operators do.
The increment operator increases its operand by one. The decrement operator decreases
its operand by one. For example, this statement:
x = x + 1;
can be rewritten like this by use of the increment operator:
x++;
Similarly, this statement:
x = x - 1;
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