Bargains With Evil
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The first thing we must understand in these code examples is the idea of '''local variables'''. Local variables are declared within methods, while the variables we have seen up until now are declared outside of methods. Local variables can ONLY be used inside their own methods, and actually only within their own block and any inner blocks. This is a principle called '''scope'''. Arguments in method signatures are also local variables. | The first thing we must understand in these code examples is the idea of '''local variables'''. Local variables are declared within methods, while the variables we have seen up until now are declared outside of methods. Local variables can ONLY be used inside their own methods, and actually only within their own block and any inner blocks. This is a principle called '''scope'''. Arguments in method signatures are also local variables. | ||
| − | A method call sets argument variables in the method. In the Innocent.main() call to Evil.bargain(), Evil.bargain()'s whatIsGiven argument is set to the String "honor". Methods can return a single value, which can be placed in a variable, used, or ignored. Evil.bargain() returns a string with the value "despair" to Innocent.main(), which places that value into the String named 'result'. | + | A method call sets argument variables in the method. In the Innocent.main() call to Evil.bargain(), Evil.bargain()'s whatIsGiven argument is set to the String "honor". |
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| + | Methods can return a single value, which can be placed in a variable, used, or ignored. A method returns a value using the '''return''' reserved word, as you see at the end of both methods of Evil. If the return type of a method is '''void''', no value is returned and there is no need for a return statement. Evil.bargain() returns a string with the value "despair" to Innocent.main(), which places that value into the String named 'result'. | ||
Arguments and returns can be any types or combination of types. | Arguments and returns can be any types or combination of types. | ||
