USER-DEFINED METHODS - Java Programming: From Problem Analysis to Program Design - page 399

{

double num1; //Line 1

double num2; //Line 2

System.out.println("Line 3: The larger of "
+ "5.6 and 10.8 is "
+ larger(5.6, 10.8)); //Line 3

System.out.print("Line 4: Enter two "
+ "numbers: "); //Line 4

num1 = console.nextDouble(); //Line 5

num2 = console.nextDouble(); //Line 6

System.out.println(); //Line 7

System.out.println("Line 8: The larger of "
+ num1 + " and " + num2 + " is "
+ larger(num1, num2)); //Line 8

}

public static double larger( double x, double y)
{

double max;

7

if (x >= y)
max = x;

else

max = y;

return max;

}

}
Sample Run: (In this sample run, the user input is shaded.)
Line 3: The larger of 5.6 and 10.8 is 10.8
Line 4: Enter two numbers: 34 43

Line 8: The larger of 34.0 and 43.0 is 43.0

You can put methods within a class in any order.

A value-returning method must return a value. Consider the following method, secret ,
which takes as a parameter an int value. If the value of the parameter, x , is greater
than 5 , it should return twice the value of x ; otherwise, it should return the value of x .

public static int secret( int x)
{

if (x > 5) //Line 1

return 2 * x; //Line 2

}