please help

Exception in thread "main" java.lang.NoClassDefFoundError: simple_inter
Caused by: java.lang.ClassNotFoundException: simple_interest
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: simple_interest. Program will exit.

here is the code :-

class a1
{
public static void main(String args[])
{
System.out.println("Enter Principal amount : ");
int p=Integer.parseInt(args[0]);
System.out.println("Enter Rate of Interest : ");
int r=Integer.parseInt(args[1]);
System.out.println("Enter No. of years : ");
int n=Integer.parseInt(args[2]);
int si=(p*r*n)/100;
System.out.println("Simple Interest = "+si);
}
}

You are trying to run a class called "simple_interest" but the actual class is called a1. The names must match.

Caused by: java.lang.ClassNotFoundException: simple_interest.java
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: simple_interest.java. Program will exit.

here is code :-

class simple_interest
{
public static void main(String args[])
{
System.out.println("Enter Principal amount : ");
int p=Integer.parseInt(args[0]);
System.out.println("Enter Rate of Interest : ");
int r=Integer.parseInt(args[1]);
System.out.println("Enter No. of years : ");
int n=Integer.parseInt(args[2]);
int si=(p*r*n)/100;
System.out.println("Simple Interest = "+si);
}
}

thx error solved

Are you trying to run from the command line? If so the commands are

Code:

---

//compile
javac ProgramName.java

//run
java ProgramName

---

how can i write this in efficient way

compiling: simple_interest.java
simple_interest.java(6): ';' expected.
DataInputStream x= New DataInputStream(system.in);

here is the code :-

import java.io.*;
class simple_interest
{
public static void main(String args[])throws IOException
{
DataInputStream x= New DataInputStream(system.in);
System.out.println("Enter Principal amount : ");
int p=Integer.parseInt(x.readline());
System.out.println("Enter Rate of Interest : ");
int r=Integer.parseInt(x.readline());
System.out.println("Enter No. of years : ");
int n=Integer.parseInt(x.readline());
float si=(p*r*n)/100;
System.out.println("Simple Interest = "+si);
}
}

Java is case sensitive. New is not the same as new.

compiling: simple_interest.java
simple_interest.java(8): Method Readline() not found in class java.io.DataInputS
tream.
int p=Integer.parseInt(x.Readline());
^
simple_interest.java(10): Method Readline() not found in class java.io.DataInput
Stream.
int r=Integer.parseInt(x.Readline());
^
simple_interest.java(12): Method Readline() not found in class java.io.DataInput
Stream.
int n=Integer.parseInt(x.Readline());
^
3 errors

here is the code after Editing :-

import java.io.*;
class simple_interest
{
public static void main(String args[])throws IOException
{
DataInputStream x=new DataInputStream(System.in);
System.out.println("Enter Principal amount : ");
int p=Integer.parseInt(x.readline());
System.out.println("Enter Rate of Interest : ");
int r=Integer.parseInt(x.readline());
System.out.println("Enter No. of years : ");
int n=Integer.parseInt(x.readline());
int si=(p*r*n)/100;
System.out.println("Simple Interest = "+si);
}
}

Please post your code in [code][/code] tags. It makes it that much easier to read.

You're trying to call the method "Readline", which doesn't exist. You might be looking for the deprecated method "readLine" - again, note the different capitalisation - but you'd be better off looking for a non-deprecated one. Here's the API.

compiling: simple_interest.java
simple_interest.java(8): Method readline() not found in class java.io.DataInputS
tream.
int p=Integer.parseInt(x.readline());
^
simple_interest.java(10): Method readline() not found in class java.io.DataInput
Stream.
int r=Integer.parseInt(x.readline());
^
simple_interest.java(12): Method readline() not found in class java.io.DataInput
Stream.
int n=Integer.parseInt(x.readline());
^
3 errors

here is the code after editing :-
<code>
import java.io.*;
class simple_interest
{
public static void main(String args[])throws IOException
{
DataInputStream x=new DataInputStream(System.in);
System.out.println("Enter Principal amount : ");
int p=Integer.parseInt(x.readline());
System.out.println("Enter Rate of Interest : ");
int r=Integer.parseInt(x.readline());
System.out.println("Enter No. of years : ");
int n=Integer.parseInt(x.readline());
int si=(p*r*n)/100;
System.out.println("Simple Interest = "+si);
}
}
</code>

Are you planning on posting each compilation big here and expecting us to fix it?

Quote:

---

Originally Posted by Tolls

Are you planning on posting each compilation big here and expecting us to fix it?

---

Cool! We'll be the online compiler; I do the parsing, you do the tokening and somebody else can do the code generation!

kind regards,

Jos ;-)