Develop Reference

How can I fix my code to find a certain character in an array and make changes to that array

while (scan_file.hasNext()) {
String b = scan_file.nextLine();
// checks if string b contains the tag <h>
if (b.contains("<h>")) {
char arrayString[] = b.toCharArray();
for (int i = 0; i < arrayString.length; i++) {
if (arrayString[i] == '<') {
arrayString[i] = arrayString[i + 2];
}
System.out.print(arrayString[i]);
}
}
}
What I was expecting the program to do was(for now) iterate through the while loop and store each line as string 'b'.
I want to check if that string b contains a certain string like <h> for this example. And I want to convert string b into an array if it contains said string like <h> and iterate through that array to check for '<' and move the array up 2 spaces.
For example, string b had <h>hello, I wanted to eventually print hello because the program would have moved up 2 elements.
I feel like I got the loops and general idea on how I want to tackle the problem.. but when I ran the program, nothing printed so I don't know if I did the loops and if statements correctly.
I really don't know how to word my problem well, so bear with me and I'm sorry in advance.
All feedbacks are greatly appreciated (:

System.out.print(arrayString[i]); just print the ith character of arrayString, it's definitely not what you want.
In fact you don't have to convert a String to char[], String has many utils method can help you with your goal.
I won't give you full code , but I can give you some tips.
You can use String.indexof('<') to find the index of '<'.
You can use String.subString(startIndex) to get the subString start with the specified index.

Suppose your code scan_file.hasNext() and scan_file.nextLine() is work well. You can try code below to remove all from current line:
if (b != null && b.contains("<h>")) {
System.out.println(b.replaceAll("<h>", ""));
}

How can I put multiple parts of a string into a list?

So the goal is to look for patterns like "zip" and "zap" in the string, starting with 'z' and ending with 'p'. Then, for all such strings, delete the middle letter.
What I had in mind was that I use a for loop to check each letter of the string and once it reaches a 'z', it gets the indexOf('p') and puts that and everything in the middle into an ArrayList, while deleting itself from the original string so that indexOf('p') can be found.
How can I do that?
This is my code so far:
package Homework;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
public class ZipZap {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
List < String > list = new ArrayList < String > ();
System.out.print("Write a sentence with no spaces:");
String sen = in .next();
int len = sen.length();
int p1 = sen.indexOf('p');
String word = null;
String idk = null;
for (int i = 0; i < len; i++) {
if (sen.charAt(i) == 'z') {
word = sen.substring(i, p1 + 1);
list.add(word);
idk = sen.replace(word, "");
i = 0;
}
}
}
}

use this , here i am using "\bz.p\b" pattern for finding any word that contains starting char with z and end with p anything can be in between
String s ="Write a sentence with no zip and zap spaces:";
s=s.replaceAll("\\bz.p\\b", "zp");
System.out.println(s);
output:
Write a sentence with no zp and zp spaces:
or it can be
s.replaceAll("z\\w+p", "zp");
here you can check you string
https://regex101.com/r/aKaNTJ/2

I think you’re saying that input zipzapityzoop, for example, should be changed to zpzpityzp with i, a and oo going into list. Please correct me if I misunderstood your intention.
You are on the way and seem to understand the basics. The issues I see are minor, but of course you want to fix them:
As #RicharsSchwartz mentions, to find all strings like zip, zap and zoop, you need to find p after every z you find. When you have found z at index i, you may use sen.indexOf('p', i + 1) to find a p after the z (the second argument causes the search to begin at that index).
Every time you have found a z, you are setting i back to 0, this starting over from the beginning of the string. No need to do that, and this way your program will never stop.
sen.substring(i, p1+1) takes out all of zip when I understood you only wanted i. You need to adjust the arguments to substring().
Your use of sen.replace(word, "") will replace all occurences of word. So once you fix your program to take out a from zap, zappa will become zpp (not zppa), and azap will be zp. There is no easy way to remove just one specific occurrence of a substring from a String. I think the solution is to use the StringBuilder class. It has a delete method that will remove the part between two specified indices, which is what you need.
Finally you are assigning the changed string to a different variable idk, but then you continue to search sen. This is like assigning zpzapityzoop, zipzpityzoop and zipzapityzp to idk in turn, but never zpzpityzp. However, if you use a StringBuilder as I just suggested, just use the same StringBuilder all the way through and you will be fine.

Printing integer to textfield area

Im having a trouble in java. Im creating a HRRN scheduling. I want to print the integer that I input into a textfield area. Please help me to solve this problem. Thankyou!
private void AWTActionPerformed(java.awt.event.ActionEvent evt) {
int firstprocess=1;
if (bt1.getText().equals("")){
double tempbt1 = Double.parseDouble(bt1.getText());
awttotalprocess = (firstprocess + (tempbt1));
AWTCLICK = 0;
jtf_awt.setText(String.valueOf(awttotalprocess+"ms"));
}
I want to print the awttotalprocess into jtf_awt.

Bracketing issue:
jtf_awt.setText(String.valueOf(awttotalprocess)+"ms");

Many classes come with what's called a .toString() method that prints a pre-specified output when joined with a string. You can concatenate or join a string and a variable -in this case an integer- like this:
int i = 50;
String join() {
return "I'm a string, next is a number: " + 50;
}
Keep in mind that int and Integer are different in that the first is a primitive data type, and the second is the object. This isn't an issue for you in this code but in the future if you try to concatenate a string with an object it may end up printing out the memory address as written in the .toString() default method and would require you to #override the method to specify your own string output. The primitive data types are "easier" to combine and don't require such .toString() overriding or .valueOf() shenanigans.

String split from a CSV - Java

I am having a small problem, I hope you can help.
I am reading a CSV in java, in which one of the column has string as follows:
a. "123345"
b. "12345 - 67890"
I want to split this like(Split it into two separate columns):
a. "123345", ""
b. "12345","67890"
Now, when I am using Java's default split function, it splits the string as follows:
a. "123345,"
b. "12345,67890" (Which is basically a string)
Any idea how can I achieve this? I have wasted my 3 hours on this. Hope any one can help.
Code as follows:
while ((line = bufferReader.readLine()) != null)
{
main = line.split("\\,"); //splitting the CSV using ","
//I know that column # 13 is the column where I can find digits like "123-123" etc..
therefore I have hard coded it.
if (main[12].contains("-"))
{
temp = main[12].split("-");
//At this point, when I print temp, it still shows me a string.
//What I have to do is to write them to the csv file.
E.g: ["86409, 3567"] <--Problem here!
}
else
{
//do nothing
}
}
after this, i will write the main[] array to the file.

Please check if java.util.StringTokenizer helps
Example:
StringTokenizer tokenizer = new StringTokenizer(inputString, ";")
Manual: StringTokenizer docs

How do I print an array without the first term?

I'm writing a program to open up links based on a command entered into a console. The command is "/wiki >term array<", and it will open up a web browser with the wiki open and the term array sent through the search function of said wiki.
Here is my current code for building the term array to send to the search field:
SearchTerm = Arrays.toString(StringTerm).replace("[", "").replace("]", "").replace(",", "");
Now, all that does is get all terms passed the word "/wiki" in my slash command and prints them into a list. It also removes commas and square brackets to make what it prints cleaner.
-- I want to add a specific parameter for the first term in the array, so if it is a specific code such as "/wiki wikipedia chickens" is entered, it will send the user to wikipedia with the term "chickens" searched instead of the default wiki with the terms "wikipedia chickens" searched.
Using the current code that I have to build the term array I need to use Arrays.toString in order to print the whole array in a readable fashion, but I don't want it to print the first term in the array after it passes through my keyword filter?
When I use this code:
WIKI_HYPERLINK = WIKI_WIKIPEDIA + StringTerm[1] + StringTerm[2] + StringTerm[3] + StringTerm[4] + StringTerm[5];
It uses array terms 1 - 5, but if there are only 3 entered terms it will throw an error, and if there are more than 5 it will throw an error.
So my question is: How do I get a whole array excluding the first term?

You could use StringBuilder in a loop
// StringBuilder with initial String
StringBuilder builder = new StringBuilder(WIKI_WIKIPEDIA);
for (int i=1; i < stringTerm.length; i++) {
builder.append(stringTerm[i]);
}
String searchTerm = builder.toString();

You could try something like this:
String outputString = "";
for (int i = 1; i < StringTerm.Length; i++)
{
outputString += StringTerm[i];
}
You may also be able to use a for each loop if there is something like if (Array.Element != 0) in Java, but I don't know of one. Just edit the code above to get it in the format you need.