Java Assignment

[javalearner]

Good Morning Guys! -- i printed the 65 page tutorial at work EXCELLENT HELP! ...

I have to write an Employee.class which grabs a (string first name, string last name, string salary) also is salary is below 0.0 - set it to = 0...

is this correct?


"//Lab4 - Employee.java
//Create a Java Class for storing employee information

public class employee
{
private String firstname; //saves first name
private String lastname; //saves lastname for input
private double salary; //saves salary for input

public employee( String firstname, String lastname, double salary) //begin constructor
{
firstname = firstname;
lastname = lastname;
salary = salary;
}

public String getfirstname()
{
return firstname;
}

public void setfirstname(St ring firstname)
{
firstname = firstname; //is this neccessary? =)
}
public String getlastname()
{
return lastname;

}
public void setlastname(Str ing lastname)
{
lastname = lastname;
}
public double getsalary()
{
return salary;
}
public void setsalary(doubl e salary)
{
if(salary < 0)
{
salary = 0;
}
}
}"

[JosAH]

public void setfirstname(St ring firstname)
{
firstname = firstname; //is this neccessary? =)
}

That is not necessary; it's wrong: it sets the parameter 'firstname' to itself which
is a useless operation; change the assignment to:
[code=java]
this.firstname= firstname;
[/code]

You'll see the same problem over and over again in your code.

kind regards,

Jos

[javalearner]

That is not necessary; it's wrong: it sets the parameter 'firstname' to itself which
is a useless operation; change the assignment to:
[code=java]
this.firstname= firstname;
[/code]

You'll see the same problem over and over again in your code.

kind regards,

Jos

Do'h! - no wonder i was recieving errors :)
alright, so if i use 'this.lastname = lastname ; that's correct?

what does 'this' mean by definition when used in java?

[javalearner]

Do'h! - no wonder i was recieving errors :)
alright, so if i use 'this.lastname = lastname ; that's correct?

what does 'this' mean by definition when used in java?

btw : when i compile and then execute - i am recieving ::
"java.lang.NoCl assDefFoundErro r: Lab4/employee (wrong name: employee)
at java.lang.Class Loader.defineCl ass1(Native Method)
at java.lang.Class Loader.defineCl ass(ClassLoader .java:620)
at java.security.S ecureClassLoade r.defineClass(S ecureClassLoade r.java:124)
at java.net.URLCla ssLoader.define Class(URLClassL oader.java:260)
at java.net.URLCla ssLoader.access $100(URLClassLo ader.java:56)
at java.net.URLCla ssLoader$1.run( URLClassLoader. java:195)
at java.security.A ccessController .doPrivileged(N ative Method)
at java.net.URLCla ssLoader.findCl ass(URLClassLoa der.java:188)
at java.lang.Class Loader.loadClas s(ClassLoader.j ava:306)
at sun.misc.Launch er$AppClassLoad er.loadClass(La uncher.java:268 )
at java.lang.Class Loader.loadClas s(ClassLoader.j ava:251)
at java.lang.Class Loader.loadClas sInternal(Class Loader.java:319 )
Exception in thread "main" "


is that just due to the fact its a class with no action?

[JosAH]

btw : when i compile and then execute - i am recieving ::
"java.lang.NoCl assDefFoundErro r: Lab4/employee (wrong name: employee)

I assume your class compiled fine then. Your class is named 'employee', not
'Lab4/employee'. Go to the directory where your employee class file is stored
and type 'java -cp . employee'.

The '-cp .' flag tells the jvm to search for .class files in the current directory.
Don't think you're ready now because that class doesn't contain a method named
public static void main(String[] args) so it still won't run but you'll get another
error message.

kind regards,

Jos

[javalearner]

I assume your class compiled fine then. Your class is named 'employee', not
'Lab4/employee'. Go to the directory where your employee class file is stored
and type 'java -cp . employee'.

The '-cp .' flag tells the jvm to search for .class files in the current directory.
Don't think you're ready now because that class doesn't contain a method named
public static void main(String[] args) so it still won't run but you'll get another
error message.

kind regards,

Jos

ohh, i know, thats the next step i believe....i need to create an app with a method and all that stuff, called employeetest.ja va -- that pulls FROM that java class...


Desktop\Lab4>ja va -cp . employee
Exception in thread "main" java.lang.NoSuc hMethodError: main

[JosAH]

ohh, i know, thats the next step i believe....i need to create an app with a method and all that stuff, called employeetest.ja va -- that pulls FROM that java class...


Desktop\Lab4>ja va -cp . employee
Exception in thread "main" java.lang.NoSuc hMethodError: main

Yep, as I wrote: there's no main method in that class. The jvm complains about it.

kind regards,

Jos

[javalearner]

Yep, as I wrote: there's no main method in that class. The jvm complains about it.

kind regards,

Jos

alright maybe i am going about this incorrectly??
//Lab4 - Employee.java
//Create a Java Class for storing employee information

public class employee
{
private String firstname; //saves first name
private String lastname; //saves lastname for input
private double salary; //saves salary for input

public employee( String firstname, String lastname, double salary) //begin constructor
{
firstname = firstname;
lastname = lastname;
salary = salary;
}

public String getfirstname()
{
return firstname;
}

public void setfirstname(St ring firstname)
{
this.firstname = firstname; //is this neccessary? =)
}
public String getlastname()
{
return lastname;

}
public void setlastname(Str ing lastname)
{
this.lastname = lastname;
}
public double getsalary()
{
return salary;
}
public void setsalary(doubl e salary)
{
if(salary < 0)
{
salary = 0;
}
}
}

that is how employee.java / employee.class ends.

//Lab 4 - 3.14
//Bring in employee.class and configure to run as an app

public class employeetest
{
public static void main(String args[])
{
employee employee1 = new employee("John" , "Smith", 50400);
employee employee2 = new employee("Jack" , "Russell", 100000);

System.out.prin tln( "Salary:");

}
}

i'm stuck here, because i am trying to bring in employee class info here...
am i doing something wrong ?

[JosAH]

alright maybe i am going about this incorrectly??
//Lab4 - Employee.java
//Create a Java Class for storing employee information

public class employee
{
private String firstname; //saves first name
private String lastname; //saves lastname for input
private double salary; //saves salary for input

public employee( String firstname, String lastname, double salary) //begin constructor
{
firstname = firstname;
lastname = lastname;
salary = salary;
}

public String getfirstname()
{
return firstname;
}

public void setfirstname(St ring firstname)
{
this.firstname = firstname; //is this neccessary? =)
}
public String getlastname()
{
return lastname;

}
public void setlastname(Str ing lastname)
{
this.lastname = lastname;
}
public double getsalary()
{
return salary;
}
public void setsalary(doubl e salary)
{
if(salary < 0)
{
salary = 0;
}
}
}

that is how employee.java / employee.class ends.

//Lab 4 - 3.14
//Bring in employee.class and configure to run as an app

public class employeetest
{
public static void main(String args[])
{
employee employee1 = new employee("John" , "Smith", 50400);
employee employee2 = new employee("Jack" , "Russell", 100000);

System.out.prin tln( "Salary:");

}
}

i'm stuck here, because i am trying to bring in employee class info here...
am i doing something wrong ?

Note that 'javac' (your Java compiler) uses the same flag '-cp .' that tells it where
it can find compiled .class files. It needs those .class files because it needs to
know what that 'employee' class is all about when it has to compile your employeetest
class.

kind regards,

Jos

[javalearner]

Note that 'javac' (your Java compiler) uses the same flag '-cp .' that tells it where
it can find compiled .class files. It needs those .class files because it needs to
know what that 'employee' class is all about when it has to compile your employeetest
class.

kind regards,

Jos

that definately makes sense - could you let me know what i need to do for that? I thought i was doing good. lol

[JosAH]

that definately makes sense - could you let me know what i need to do for that? I thought i was doing good. lol

Just type 'javac' on your command line and the compiler tells you everything you
wanted to know but were too afraid to ask ;-)

kind regards,

Jos