Develop Reference

Getting runtime error in basic code in code jam

/*package whatever //do not write package name here */
import java.util.*;
class Nested {
public static void main (String[] args) {
Scanner in=new Scanner(System.in);
int t=in.nextInt();
while(t-->0)
{
String input=in.nextLine();
//solve(input);
}
}
}
I am passing
1
1
as input but it is showing me runtime error...don't know why because its working fine on geeksforgeeks ide

Code Jam accept classname as Solution
That was the issue!
Thanks a lot everyone for helping!

Nothing appears when typing when using java scanner

I have a very simple java script, where i have a scanner and want to type into the console. But nothing shows up on the console when I type in eclipse. I don't understand what's wrong.
import java.io.*;
import java.util.*;
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("yo");
}
}

You are not take any input.
Try to wait an input first:
String nextInput = input.nextLine();
System.out.println(nextInput);

Well you should use:
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println(input.next());
}
Now you will get what you will write in console

The output file value is null (0KB)

I'm trying to write file using using file writer but the value is null :
FileReader inCorpus2=new FileReader("output2.txt");
FileWriter outCorpus2=new FileWriter("Doc2(THE WANTED FILE).txt");
Scanner sc2=new Scanner(inCorpus2);
try{
while(sc2.hasNextLine()){
String tempLine=sc2.nextLine();
Scanner sc3=new Scanner(tempLine);
while(sc3.hasNext()){
String temp=sc3.next();
for(int i=0;i<UC.length;i++){
for(int j=0;j<temp.length();j++){
if(temp.charAt(j)==UC[i])temp=removeChar(temp,j);
}
}
And this is the error massage :
Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Unknown Source)
at aya.SecondFilePreproc.main(SecondFilePreproc.java:25)
I hope i was clear , i tried my best .. help me please .

Not sure if it's help, need to see full code. Just added some exceptions.
import java.io.*;
import java.util.Scanner;
public static String removeChar(String x,int y){
return "something";
}
public class SomeClass {
public static void main(String[] args) throws FileNotFoundException, IOException {
try(FileReader inCorpus2=new FileReader("output2.txt");
FileWriter outCorpus2=new FileWriter("Doc2(THE WANTED FILE).txt");
Scanner sc2=new Scanner(inCorpus2)
){
while(sc2.hasNextLine()){
String tempLine=sc2.nextLine();
Scanner sc3=new Scanner(tempLine);
while(sc3.hasNext()){
String temp=sc3.next();
//just a guess what is UC
//char UC[]={'A','B','C'};
}
for(int i=0;i<UC.length;i++){
for(int j=0;j<temp.length();j++){
if(temp.charAt(j)==UC[i])temp=removeChar(temp,j);
}
}
}
}
}
}

error: cannot find symbol: class FileNotFoundException

I'm receiving the following error:
printfile.java:6: error: cannot find symbol
throws FileNotFoundException {
^
symbol: class FileNotFoundException
location: class printfile
for the following code:
import java.io.File;
import java.util.Scanner;
public class printfile {
public static void main(String[]args)
throws FileNotFoundException {
Scanner keyboard = new Scanner(System.in);
System.out.println (" What file are you looking for? ");
String searchedfile = keyboard.next();
File file = new File(searchedfile);
if (file.exists()) {
System.out.println(" Okay, the file exists... ");
System.out.print(" Do you want to print the contents of " + file + "?");
String response = keyboard.next();
if (response.startsWith("y")) {
Scanner filescan = new Scanner(file);
while (filescan.hasNext()) {
System.out.print(filescan.next());
}
}
else {
System.out.print(" Okay, Have a good day.");
}
}
}
}
How can this error be resolved?

To use a class that is not in the "scope" of your program, (i.e. FileNotFoundException), you have to:
Call it's fully qualified name:
// Note you have to do it for every reference.
public void methodA throws java.io.FileNotFoundException{...}
public void methodB throws java.io.FileNotFoundException{...}
OR
Import the class from it's package:
// After import you no longer have to fully qualify.
import java.io.FileNotFoundException;
...
public void methodA throws FileNotFoundException{...}
public void methodB throws FileNotFoundException{...}
Suggest also taking a look in this question, explains pretty much everything you might want to know about Java's acess control modifiers.

FIleNotFoundException - illegal start of expression - NetBeans

I get the following error message 'llegal start of expression' at line
throws FileNotFoundException
I have done some research but wasn't able to fix it. Can you help? Many thanks, zan
import java.io.FileNotFoundException;
import java.io.File;
import java.util.Scanner;
import static java.lang.System.out;
public class training{
public static void main(String[]args){
throws FileNotFoundException{
Scanner diskScanner = new Scanner(new File("occupancy"));
out.println("Room\tGuests");
for(int roomNum = 0; roomNum < 10; roomNum ++){
out.print(roomNum);
out.print("\t");
out.println(diskScanner.nextInt());
}
}
}
}

You shouldn't have a curly brace before the throws keyword :
public static void main(String[]args) throws FileNotFoundException {
^-- no curly brace
Note that a class should always start with an uppercase letter.

Improper use of throws.
public static void main(String[]args) throws FileNotFoundException
{
..
}
It is better to use try..catch
public static void main(String[]args)
{
try
{
..
}catch(FileNotFoundException ex)
{
//
}
}

Your syntax is wrong. Check your source and/or the language specification.