//Text-printing program.
public class Welcome1
{
//main method begins executiion of Java
public static void main( String args[] )
{
System.out.println( "Welcome to Java Programming!" ); // System.out.println( "Text" ) will print what's written within "", in this case it will print Welcome to Java Programming!
} //end method main
} //end class Welcome1
This is save as Welcome1.java and to this printer in cmd I need to give the correct place which is C:\Users\Valentin\Documents\Programmera_i_Java\Java_source_file so I write in cmd
cd C:\Users\Valentin\Documents\Programmera_i_Java\Java_source_file
After writing java Welcome3 I get this
C:\Users\Valentin\Documents\Programmera_i_Java\Java_source_file>java Welc
Exception in thread "main" java.lang.NoClassDefFoundError: Welcome3
Caused by: java.lang.ClassNotFoundException: Welcome3
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: Welcome3. Program will exit.
C:\Program Files\Java\jdk1.6.0_23\bin is the system enironment and I have made a special Folder called Programing in Java where C:\Users\Valentin\Documents\Programmera_i_Java\Java_source_file is added in Exclusions of Execution Control Settings and also in D+ rules as Trusted programs.
I have learned a little Java but not much outside of it, like using it with CMD. (And I’ve forgotten a lot of Java, after messing with Python and now doing a web design course with HTML, CSS, and Javascript. I have focus issues. :P)
Welcome3. I have found the mistake this morning; I will highlight the mistake
public class Welcome3
{
public static void main( String args[] )
{
System.out.println( "Welcome to Java Programming!" );
}
} //end class Welcome3
the right code
public class Welcome3
{
public static void main( String args[] )
{
System.out.println( "Welcome\nto\nJava\nProgramming!" );
}
}
One thing that I notice after long time is that I need to double click on my java source file that puts javac.exe (java’s compiler) to create the wanted classes and the I should try to run the wanted class in cmd.
Thanks once again for all the help. It’s really appreciated
Can anyone tell me what is wrong within this source code. Thanks in advance.
//Addition program that displays the sum of two number
import java.util.Scanner; // program uses class Scanner
public class Addition
{
public static void main( String args[] )
{
Scanner input = new Scanner( System.in ); // create method to obtain input from command windows
int number1; // First number to add
int number2; // Second number to add
int sum; // sum of number1 and number 2
System.out.print( "Enter first integer: " ); // prompt
number1 = input.nextInt(); // read first number from user
System.out.print( "Enter second integer: "); // prompt
number2 = input.nextInt(); // read first number from user
sum = number1 + number2; // add numbers
System.out.printf( " Sum is %d\n", sum ); // display sum
}
}
import java.util.Scanner;
public class Calculate {
public static void main( String args[] ) {
Scanner input = new Scanner ( System.in);
int number1; // first number
int number2; // second number
int number3; // third number
int largest; // largest value
int smallest; // smallest value
int sum; // sum of numbers
int product; // product of numbers
int average; // average of numbers
System.out.print("Enter first integer:");//Prompt
number1 = input.nextInt(); //read first number from user
System.out.print("Enter second integer:");//Prompt
number2 = input.nextInt(); //read second number from user
System.out.print("Enter third interger:");//prompt
number3 = input.nextInt(); //read third number from user
// Make the number1 as maximum
largest = number1;
if(largest < number2)
largest = number2;
if(largest < number3)
largest = number3;
System.out.println("Maximum is: " + largest);
// Make the number1 as minimum
smallest = number1;
if(smallest > number2)
smallest = number2;
if(smallest > number3)
smallest = number3;
System.out.println("Smallest is: " + smallest);
} // End of method
} // End of class
maybe this might help, something to compare to I guess
I am trying to make f(x)=x/0.735kW in java and I have no luck and I can’t see what I am doing wrong or what is missing. The code source code is below
// Vi ska skapa en formel som beskriver hur man många kW som används då x antal HK används.
import java.util.Scanner; // Programmet använder class Scanner
public class HK_till_kW
{
//
public static void main( String args[] )
{
// skapar Scanner för att kunna få input från cmd.exe dvs kommandotolken
Scanner hästkrafter = new Scanner( System.in );
double antal_HK;
double HK_kW;
double kW;
System.out.print( "Ange antal hästkrafter som ska omvandlas till kW: " ); // Frågar användaren
antal_HK = hästkrafter.nextDouble(); // Inslagna värdet från användaren
HK_kW = 0.735;
kW = antal_HK / HK_kW ; // De angivna hästkrafter divideras med vad en hästkraft är i kW
System.out.printf( "Resultat är %d\n", kW ); //Resultatet kommer att visas
}
}
