Commanding The Demons
From Huben's Wiki
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Today we will study the basic principles by which we command demons, and make them dance to our whims! | Today we will study the basic principles by which we command demons, and make them dance to our whims! | ||
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*** The '''name of the method'''. That is our primary concern today! The only method for this demon is 'main'. | *** The '''name of the method'''. That is our primary concern today! The only method for this demon is 'main'. | ||
*** What you will pay the demon. This price is called the '''arguments''' of the method, and for this demon there is a standard price. Not blood as you may think, but 'String[] args'. These too shall be made clear as we progress. You will notice that the '''arguments''' are enclosed in ordinary parentheses. If there is more than one argument, they are separated by commas. | *** What you will pay the demon. This price is called the '''arguments''' of the method, and for this demon there is a standard price. Not blood as you may think, but 'String[] args'. These too shall be made clear as we progress. You will notice that the '''arguments''' are enclosed in ordinary parentheses. If there is more than one argument, they are separated by commas. | ||
| − | ** A '''signature''' can be recognized by residing within the class body and having a name followed by arguments enclosed in parentheses. Betimes there will be a long list of arguments inside the parentheses. Other times there will be no arguments but still there will be parentheses to show where they might be: '()'. Fear not the complexity of the arguments; recognize only that they are enclosed in parentheses. | + | ** A '''signature''' can be recognized by residing within the class body and having a name followed by arguments enclosed in parentheses. Betimes there will be a long list of arguments inside the parentheses. Other times there will be no arguments but still there will be parentheses to show where they might be: '()'. Fear not the complexity of the arguments; recognize only that they are enclosed in parentheses and separated by commas. |
| − | ** Other important names of the '''signature''' include '''declaration''' and '''header'''. | + | ** Other important names of the '''signature''' include '''declaration''' and '''header''': these are synonymous. |
* The second part of the '''method''' is called the '''body'''. | * The second part of the '''method''' is called the '''body'''. | ||
** Just as the class body is enclosed in curly braces, so a method body is enclosed in curly braces. And again, curly braces make a block and so a method body is a block. | ** Just as the class body is enclosed in curly braces, so a method body is enclosed in curly braces. And again, curly braces make a block and so a method body is a block. | ||
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* Peer into studentdisk/Ch11/Exercises/Triangle.java, and seek ye the five methods therein. One of them is different: it bears the same name as the class and thus has yet another difference from all the other methods? Know thou this difference? | * Peer into studentdisk/Ch11/Exercises/Triangle.java, and seek ye the five methods therein. One of them is different: it bears the same name as the class and thus has yet another difference from all the other methods? Know thou this difference? | ||
* We call such methods '''constructors''': they are special, and we will learn of them later. | * We call such methods '''constructors''': they are special, and we will learn of them later. | ||
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| + | ==(D) After Class Demonology== | ||
| + | * Peer into studentdisk/Ch20/Teletext/TeletextList.java, and list the methods therein. List also the number of arguments for each method. | ||
