Quite Irked :\

So, lately I have taken an interest in Java, and have attempted to learn it, but I find myself unable to actually learn anything. These online tutorials slap a code in my face, cool, I have no idea what it means, why you have to type certain things. What would happen if I were to substitute it with something? Are there certain words I can use? Like.. I'm utterly confused.

This is what I have learned, I'll bold the things I need help with:

public class Hello World {

public static void main (String[] args) {

System.out.println ("Hello World!");

}//End of main

}//End of class

What exactly does all of this do? Yes, I know I have to run it via Command Prompt, but I want to know why I have to type certain things.

Are there things I can substitute for static, void, main, args? What is all of this doing?!?! I'm quite annoyed by this, because if I don't know what they do, I will be unable to write my own program.

Please help :\

Quote:

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Originally Posted by Hyperion

So, lately I have taken an interest in Java, and have attempted to learn it, but I find myself unable to actually learn anything. These online tutorials slap a code in my face, cool, I have no idea what it means, why you have to type certain things. What would happen if I were to substitute it with something? Are there certain words I can use? Like.. I'm utterly confused.

This is what I have learned, I'll bold the things I need help with:

public class Hello World {

public static void main (String[] args) {

System.out.println ("Hello World!");

}//End of main

}//End of class

What exactly does all of this do? Yes, I know I have to run it via Command Prompt, but I want to know why I have to type certain things.

Are there things I can substitute for static, void, main, args? What is all of this doing?!?! I'm quite annoyed by this, because if I don't know what they do, I will be unable to write my own program.

Please help :\

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Java applications are always going to be class method structured. The main method must always be static. Also the name of the file MUST be the same name as the class.

i.e. class name is DataRecovery, source for DataRecovery is DataRecovery.java

It is customary that the class name have no spaces.

As far as the String[] args, the compiler allocates an array of Strings based on what you type at the command line.

For example:

Code:

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javac -cp . HelloWorld.java

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This will result in a Foo.class being created.

To run your new HelloWorld class do the following:

Code:

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java -cp . HelloWorld

---

If I typed:

Code:

---

java -cp . HelloWorld Hello Goodbye Yes No

---

Then the String[] args would be dimensioned to 4 elements and the array would be as follows:
args[ 0 ] = "Hello"
args[ 1 ] = "Goodbye"
args[ 2 ] = "Yes"
args[ 3 ] = "No"

I hope this helps.

Quote:

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Originally Posted by stchman

Java applications are always going to be class method structured. The main method must always be static. Also the name of the file MUST be the same name as the class.

i.e. class name is DataRecovery, source for DataRecovery is DataRecovery.java

It is customary that the class name have no spaces.

As far as the String[] args, the compiler allocates an array of Strings based on what you type at the command line.

For example:

Code:

---

javac -cp . HelloWorld.java

---

This will result in a Foo.class being created.

To run your new HelloWorld class do the following:

Code:

---

java -cp . HelloWorld

---

If I typed:

Code:

---

java -cp . HelloWorld Hello Goodbye Yes No

---

Then the String[] args would be dimensioned to 4 elements and the array would be as follows:
args[ 0 ] = "Hello"
args[ 1 ] = "Goodbye"
args[ 2 ] = "Yes"
args[ 3 ] = "No"

I hope this helps.

---

Helps a tad bit. Could you refer me to something that would help me understand what "String", "args", etc are doing? Like, is there an index of sorts I can refer to?

The best way i can help you is to try to get you to google each of those terms individually. google java public, java main, java void and so on. Java is very popular, so there is a ton of information out there.

google the 'really big index' tons of info there.

Quote:

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Originally Posted by Willriker

google the 'really big index' tons of info there.

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Thanks! HUGE amounts of information there, I'm amazed at the amount of information there. Thank you, hopefully I will be able to retain most of the information ^^

Quote:

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Originally Posted by Hyperion

hopefully I will be able to retain most of the information

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The beauty of the internet is you don't have to.

Quote:

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Originally Posted by Hyperion

Thanks! HUGE amounts of information there, I'm amazed at the amount of information there. Thank you, hopefully I will be able to retain most of the information ^^

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If you do, you'll be better than 90% of us. If you're like the rest of us, you'll retain that which you use and re-use.

Best of luck, and have fun coding!

Quote:

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Originally Posted by Fubarable

If you do, you'll be better than 90% of us. If you're like the rest of us, you'll retain that which you use and re-use.

Best of luck, and have fun coding!

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Yeah, I'm finding myself getting a bit confused with some things, but the index is a useful tool in aiding me. :D