USER-DEFINED METHODS - Java Programming: From Problem Analysis to Program Design - page 390

Suppose that there are two class es Test1 and Test2 . Both classes contain the
static method printAll , and you want to use these classes in a program. To
correctly use the method printAll , you should call this method using the name of the
class and the dot operators.

The ( public ) static methods of the class Character have similar conventions.
Example 7-1 illustrates how to use predefined methods.

EXAMPLE 7-1

This example shows you how to use some of the predefined methods:

//How to use the predefined methods

import static java.lang.Math.*;
import static java.lang.Character.*;

public class PredefinedMethods
{

public static void main(String[] args)
{

int x;
double u;
double v;

System.out.println("Line 1: Uppercase a is "
+ toUpperCase('a'));

//Line 1

u = 4.2; //Line 2

v = 3.0; //Line 3

System.out.printf("Line 4: %.1f to the power "
+ "of %.1f = %.2f%n",
u, v, pow(u, v)); //Line 4

System.out.printf("Line 5: 5 to the power of "
+ "4 = %.2f%n", pow(5, 4)); //Line 5

u = u + Math.pow(3, 3); //Line 6

System.out.printf("Line 7: u = %.2f%n", u); //Line 7

x = -15; //Line 8

System.out.printf("Line 9: The absolute value "
+ "of %d = %d%n", x, abs(x)); //Line 9

}

}