Sams Teach Yourself C in 21 Days

Working with Java Classes and Methods 729

BD5

5: public void displayText(String message, boolean newline) {

6: // Displays message on the console, moving to

7: // the start of a new line after message only

8: // if newline is true.

9: if (newline)

10: System.out.println(message);

11: else

12: System.out.print(message);

13: }

14:

15: public double halfOf(double value) {

16: // Returns half of its argument.

17: return value / 2;

18: }

19:

20: public long sumOf(long value1, long value2) {

21: // Returns the sum of its arguments.

22: long result;

23: result = value1 + value2;

24: return result;

25: }

26: }

LISTINGB5.4 MethodsDemo.java demonstrates using class methods

1: import java.lang.Double;

2: import java.lang.Long;

3:

4: public class MethodsDemo {

5: public static void main(String args[]) {

6: ClassWithMethods The_Class;

7: String temp;

8: double d;

9: long l;

10:

11: The_Class = new ClassWithMethods();

12: The_Class.displayText(“Using ClassWithMethods:”, true);

13: The_Class.displayText(“Half of 99 is “, false);

14: d = The_Class.halfOf(99);

15: temp = Double.toString(d);

16: The_Class.displayText(temp, true);

17: The_Class.displayText(“The sum of 12345 and 997766 is “, false);

18: l = The_Class.sumOf(12345, 997766);

19: temp = Long.toString(l);

20: The_Class.displayText(temp, true);

21: }

22: }

LISTINGB5.3 continued

40 448201x-Bonus5 8/13/02 11:23 AM Page 729