Develop Reference

Is there a way to take a string from inside a public static void and move it "outside" into a new class into a public static string?

In a small example, I'm trying to take information from the String "helloFromMain" in a file called Main.java and move it "outside" the public static void into a public static string in a different file named data.java.
IN THE FILE MAIN.JAVA
public class Main {
public static void main(String[] args){
String helloFromMain = "hello";
}
}
IN THE FILE DATA.JAVA
public class Data {
public static String helloFromData = helloFromMain;
}
Any help would be appreciated.
Also im relatively new to all this

You can set a public static variable from another class.
public class Main {
public static void main(String[] args){
String helloFromMain = "hello";
Data.helloFromData = helloFromMain;
}
}
Also, I've found that it's helpful to set a package for all classes, as it makes it simpler to manage importing and FS structure.

You can do it like this
Simple way.
IN THE FILE MAIN.JAVA
public class Main {
public static String helloFromMain; //declare a public static string, it will be accessible from outside the class.
public static void main(String[] args){
helloFromMain = "hello";
}
}
IN THE FILE DATA.JAVA
public class Data {
public static String helloFromData = Main.helloFromMain;
}
But be aware that Main.helloFromMain will be null until you call the main constructor.
Advance way :
IN THE FILE MAIN.JAVA
public class Main {
private static String helloFromMain; //This time the static variable is private, so you can't directly use it from outside
public static void main(String[] args){
helloFromMain = "hello";
}
//We create a public static method to access the private static variable
public static String getHelloFromMain(){
return helloFromMain;
}
}
IN THE FILE DATA.JAVA
public class Data {
//We call our public static method from Main.
public static String helloFromData = Main.getHelloFromMain();
}

You can create a static method in class Data to set the value of the string. If you do this, you don't need to make the variable in class Data public.
public class Main {
public static void main(String[] args) {
String helloFromMain = "hello";
Data.setHelloFromData(helloFromMain);
}
}
public class Data {
private static String helloFromData;
public static void setHelloFromData(String newValue) {
helloFromData = newValue;
}
}

How can I use a Variable from a Class Runner to use in a Method in another Class? (BlueJ, Java)

I'm taking a coding class using BlueJ, and decided to surprise my teacher with a Text Adventure that uses a Class Runner and another class to have the methods to call. The problem is, I don't know how to use a variable that I established in the Runner, into a method in the Method Class, which I will then call into the Runner. Here is my code:
(This is the runner)
import java.util.*;
public class TextAdventureRunner
{
public static void main (String[]Args)
{
TextAdventureCode run = new TextAdventureCode();
Scanner kb = new Scanner(System.in);
String x = "";
System.out.print("Enter Your Name: : ");
x = kb.nextLine();
System.out.println(x);
run.Hi();
run.HiTwo();
}
}
(This is the code that contains the methods)
import java.util.*;
public class TextAdventureCode extends TextAdventureRunner
{
Scanner kb = new Scanner(System.in);
public static void Hi()
{
System.out.println("Hi" + x);
}
public static void HiTwo()
{
System.out.println("");
}
}
You see, In my method Hi(), there is an error where the x should be. the error reads "cannot find symbol - variable x" even though i extended the class and declared an object in the other class... any help?

You can declare your TextAdventureCode like this:
import java.util.*;
public class TextAdventureCode extends TextAdventureRunner
{
Scanner kb = new Scanner(System.in);
public static void Hi(String x) //Modification
{
System.out.println("Hi" + x);
}
public static void HiTwo()
{
System.out.println("");
}
}
And declare TextAdventureRunner like this:
import java.util.*;
public class TextAdventureRunner
{
public static void main (String[]Args)
{
TextAdventureCode run = new TextAdventureCode();
Scanner kb = new Scanner(System.in);
String x = "";
System.out.print("Enter Your Name: : ");
x = kb.nextLine();
System.out.println(x);
run.Hi(x); // Modification
run.HiTwo();
}
}

Java - call void function that print my name

public class Main {
public static void main(String[] args) {
**how i call the function here** ?
}//public
public static void nameAndAge() {
System.out.println("Name: Rubik Seviyants Age: 27");
}
}//main

package com.pervacio.adminportal.tradein.constants;
public class Main {
public static void main(String[] args) {
nameAndAge();
}//public
public static void nameAndAge() {
System.out.println("Name: Rubik Seviyants Age: 27");
}
}//main
Please read this for better understanding: Java Methods | Tutorials Point

If the function that has to be called is in the same class then just call the function like this:
function_name(parameters);
But if the function is in another class then you will have to create an object of the class and call:
Class_name object_name=new Class_name(); object_name.function_name();

These are the ways to call the function :
public class Main {
public static void main(String[] args) {
nameAndAge();
// or
Main.nameAndAge();
// or
Main s=new Main();
s.nameAndAge();
} //public
public static void nameAndAge() {
System.out.println("Name: Rubik Seviyants Age: 27");
}
}

Access to variables in same class but different methods in java

i'm new with java and i have some a difficult to access some variables from different methods but in the same class.
my code:
class upgradeSim {
public static void main(String[] args) throws JSchException {
System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
Scanner inputVer = new Scanner(System.in);
String uiVersion = inputVer.nextLine();
}
public static void SendShhCmd() {
//some code
}
public static void StartUpgrade() throws JSchException {
String cmd = ("SCP data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
}
}
the problem is that StartUpgrade method does not recognized uiVersion variable.
i tired using "this" and "super" but no luck...
thanks for the help.

Declare the uiVersion as a static member of the upgradeSim class:
class upgradeSim {
public static String uiVersion;
public static void main(String[] args) throws JSchException {
System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
Scanner inputVer = new Scanner(System.in);
uiVersion = inputVer.nextLine();
}
...
public static void StartUpgrade() throws JSchException {
// Now, 'uiVersion' is accessible
String cmd = ("SCP data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
}
}

Make uiVersion a class variable:
class upgradeSim {
public static String uiVersion;
etc.
}
And set the variable in your main method like this:
uiVersion = inputVer.nextLine();

You should create a global variable named uiVersion like this:
class upgradeSim {
static String uiVersion ;
public static void main(String[] args) throws JSchException {
...
uiVersion = inputVer.nextLine();
...

uiVersion varibale is local, only accessible in main method, so you cannot access to it from StartUpgrade method.
Declare the uiVersion as a static member of the UpgradeSim class
class UpgradeSim {
private static String UI_VERSION;
public static void main(String[] args) throws JSchException {
System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
Scanner inputVer = new Scanner(System.in);
UI_VERSION = inputVer.nextLine();
}
public static void SendShhCmd() {
//some code
}
public static void StartUpgrade() throws JSchException {
String cmd = ("SCP data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
// use UI_VERSION;
}
}

Is it possible to get terminal input in init()?

I have this code:
public class test {
init() {
//How can i get access of args?
}
public static void main(String[] args) {
new test();
}
How can I get access of "args" in init()?

Just pass it as an argument.
public class test{
init(String[] args){
//How can i get access of args?
}
public static void main(String[] args) {
test t = new test();
t.init(args);
}
}
Remember, you should capitalise your class names.

Define an instance field within the class, and create constructor to accept the array and set the field:
public class test{
String[] args;
public test(String[] args){
this.args = args;
}
init(){
}
}
public static void main(String[] args) {
new test(args);
}
Or pass it as an argument to the method.
init(String[] args){
}
If init requires anything within the test class, you must create an instance of the class
test t = new test();
t.init(args);
If init does not require a new instance of test (eg doesn't access any instance variables or methods) you could define init as static and directly call the method:
static init(String[] args){//method declaration
}
public static void main(String[] args) {
test.init(args);//call the method in a static way
}