java!! help please!

halu guys.. uhm, just wanna ask if u have a method that can read each letter in a string if so.. please post it here.. i just badly need it.. example : halu
it can return. h - if i want to return this letter
or a - if this is what i want...
please help me.. tnx so much....

 

Log in or Sign up to hide all adverts.

Isn't a string an array of characters? Doesn't each character have it's own adress?

 

Log in or Sign up to hide all adverts.

In Java, a string is not simple an array of characters it is actually an object. To reach each character there is a method called charAt(int). You can call it as follows

Code:

char first = myString.charAt(0);
char second = myString.charAt(1);

etc.

-AntonK

 

Log in or Sign up to hide all adverts.

so u mean.. if i input a value.. the first one has owedi the address of 0? or do i hav 2 set it??

 

You know, I used to ask a lot of brief questions like this myself, but then I started writing short, 5-10 line programs to test these sort of questions, and I find that it has helped me greatly in the long run.

Just to get you started on this question, here's the outline of a program that will answer your query:

Create a program with a string variable declared, like "Hello", and run Anton's suggested code on it, after that, just System.out.println the two variables (first and second) and see what you get.

Alternatively, you could have answered your question by looking at the API documentation, located here: http://java.sun.com/j2se/1.4.2/docs/api/index.html, then click inside the bottom left window, scroll down to "String", and after clicking on that, scrolling down inside the rightmost frame until you see the description for the charAt(int index) method. It describes the "addressing system" of the method there, along with some other useful information.

 

Something I still use, but it might or might not be found in Java is the string.split() method in Javascript.

What it does is allow a character (or characters) to be assigned to define when a string should be split and it's components placed into their own array. It's usually used when dealing with cookies, however I found it useful for storeing multiple arrays of information.

(Note: I'm not saying this works with Java)

A Javascript example would either of these, the long way first and the short way second.

Code:

#########--1st--###########
var str=new Array()
str[0]="";
str[1]="blank.gif";
str[2]="click%20to%20view";
str[3]="180";
str[4]="135";
str[5]="TOP";
str[6]="";
########################

or with the .split()

#########--2nd--###########
var string="@blank.gif@click%20to%20view@180@135@TOP@";
var str=string.split("@");
########################

Also another ones that might cross over to Java are:
string.indexOf() and string.lastIndexOf()
These are both used for getting the location number of a character, indexOf() reads for left to right, while lastIndexOf() reads from right to left.

if the string was the word "relativity"
string.indexOf("a") would give you the number "3" as an answer
while string.lastIndexOf("a") would give you the number "6"

 

ok.. tnx guys.. so much.. i do have another inquiry.. what does this mean???
Note: C:\BACKUP FROM d\CoLLeGE FiLes\3rd yr- 2nd sem\cs 241\prelims\projs\ConversionApplet.java uses or overrides a deprecated API.

what do i have to do with this? should install a software or something?

sori for being "makulit".. i just don't know java that much...

 

When you compile there should be a -depreciation flag in javac to set. It should work if your use that flag when compiling. Does it by any chance say what class is depreciated? I might be able to find a newer one that does the same thing so you don't have to keep using the depreciation flag all the time.

 

o yeah.. just dscovered it a while ago.. ehehehe.. nwai, uhm.. i have another problem..uhm, my prgrom won't execute.. error: "Exception in thread "main" java.lang.NoClassDefFoundError: "

what does this mean??

 

You didnt execute it properly. To execute a java program, say your java file is named myprog.java, you'll write

Code:

java myprog

Thats it. Easy. Make sure you don't type

Code:

java myprog.class

or

Code:

java prog.java

, those won't work.

-AntonK

 

ah ok.. guys! can u do me a favor? can u debug my program.. coz i really don't know wats wrong with it.. nwai, f its ok... can u give me ur add coz i cant post it here.. it's so embarassing e...tnx n advance...

 

If you want us to debug your program, you should past it here so that the errors and, more importantly, the solutions can be shared with everybody.

 

No offense meant, but I refuse from now on to help or even respond to anyone that types like this. A few acronyms here and there are acceptable, but what you posted was barely even language. Please spell properly and use proper English grammar. No one here is going to tear you apart for a misspelled word, but seriously what you typed there was horrible.

-AntonK

 

i think the .split() method for javascript talked about above is similar to StringTokenizer() in java?