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Introducing Methods A method is a collection of statements that are grouped together to perform an operation. 1 KING ABDULAZIZ UNIVERSITY ‫جامعة الملك عبد العزيز‬  Introducing Methods, cont...

Introducing Methods A method is a collection of statements that are grouped together to perform an operation. 1 KING ABDULAZIZ UNIVERSITY ‫جامعة الملك عبد العزيز‬  Introducing Methods, cont. Method signature is the combination of the method name and the parameter list. The variables defined in the method header are known as formal parameters. When a method is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. 2 KING ABDULAZIZ UNIVERSITY ‫جامعة الملك عبد العزيز‬  Introducing Methods, cont. A method may return a value. The returnValueType is the data type of the value the method returns. If the method does not return a value, the returnValueType is the keyword void. For example, the returnValueType in the main method is void. 3 KING ABDULAZIZ UNIVERSITY ‫جامعة الملك عبد العزيز‬  CAUTION A return statement is required for a nonvoid method. The following method is logically correct, but it has a compilation error, because the Java compiler thinks it possible that this method does not return any value. public static int sign(int n) { if (n > 0) return 1; else if (n == 0) return 0; else if (n < 0) return –1; } To fix this problem, delete if (n