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3.3.1 while Loop
The syntax of a while loop is
while (boolean expression) {
one or more statements;
}
The block of statements is repeatedly executed while the boolean expression evaluates to
true. As an example, we can rewrite the OutputArray program of Section 2.5.6 and
assign values to array elements intArray[0] and intArray[1] using a while loop.
OutputArray
1 public class OutputArray {
2
3 public static void main(String[] args) {
4 int i=0;
5 int intArray [];
6
7 intArray = new int [2];
8 while (i < intArray.length) {
9 intArray[i] = i + 1;
10 i++;
11 }
12 System.out.println(''Values of intArray are " +
13 intArray[0] + " and " + intArray[1]);
14 }
15 }
3.3.2 do while Loop
The syntax of a do while loop is
do {
one or more statements;
} while (boolean expression) ;
OutputArray
Unlike a while loop, a do while loop is guaranteed to execute at least once. In the
OutputArray example of the previous section, the while loop (lines 8–11) can be
replaced by the following do while loop:
do {
intArray[i] = i + 1;
i++;
} while (i < intArray.length);