hello

**dipakshah8944** · June 21st, 2012, 07:02 AM

hello everyone.

I tried to find out correct section to ask this question,but i could not find way. could you suggest with answer?

my code:

class a{
public static void main(String args[]){
int i=10;
System.out.println(i);
}
class b{
public void max(){
System.out.println("i");
}
}
}

my q: i want printout of class b. what is wrong?

**Norm** · June 21st, 2012, 07:07 AM

What would a "printout of class b" look like? What does your code print now?
Post the program's output and explain what is wrong with it and show what you want the output to look like.

**dipakshah8944** · June 21st, 2012, 07:22 AM

Originally Posted by Norm

What would a "printout of class b" look like? What does your code print now?
Post the program's output and explain what is wrong with it and show what you want the output to look like.

print now :
10

want the output :
10
i

**Norm** · June 21st, 2012, 07:57 AM

Is the second line you want for output from the println statement in the b class's max() method?
To execute the max() method you need to
1)create an instance of the b class
and use that to
2)call the max() method.

**dipakshah8944** · June 21st, 2012, 08:29 AM

Please write new code.

**Norm** · June 21st, 2012, 08:45 AM

Please write new code.

Sorry, the idea is for you to write the code and to ask us questions when you have a problem.

Which part(s) are you having problems with?
1) create instance of the b class
2)calling the max() method

**dipakshah8944** · June 21st, 2012, 09:08 AM

i don know . i m not just getting. i did this.

class a{
public static void main(String args[]){
int i=10;
char k=max();
System.out.println(i);
System.out.println(k);
}
class b{
public void max(){
System.out.println("i");
}
}
}

**Norm** · June 21st, 2012, 09:11 AM

Try doing the first step: create an instance of the b class.
You will need that to be able to call any methods in the b class.

When you get errors you need to copy and paste the full text here.

When you post code, wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

**dipakshah8944** · June 21st, 2012, 09:27 AM

class a{
public static void main(String args[]){
int i=10;
char k=max();
char j=class b(max);
System.out.println(i);
System.out.println(j);
}
class b{
public void max(){
System.out.println("i");
}
}
}

**Norm** · June 21st, 2012, 09:30 AM

Where does the code try to create a new instance of the b class?

Take a look at the tutorial for some examples:
Lesson: Object-Oriented Programming Concepts (The Java™ Tutorials > Learning the Java Language)

When you get errors you need to copy and paste the full text here.

**dipakshah8944** · June 21st, 2012, 09:53 AM

class a{
 public static void main(String args[]){ 
	int i=10;
	b j=new b();
	System.out.println(i); 
	System.out.println(j);
 
  }  
  class b{  
 
  public void max(){ 	
	System.out.println("i"); 
  }
}
}
 
using cmd. how i copy error?

**Norm** · June 21st, 2012, 09:58 AM

That looks like you can create an instance of the b class.

Now try calling the b class's max() method using that new object (j) that the code creates.

On Windows: To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit and click 'Copy'

Paste here.

**dipakshah8944** · June 21st, 2012, 10:05 AM

class a{
 public static void main(String args[]){ 
	int i=10;
	b j=new b();
	System.out.println(i); 
	System.out.println(j);
 
  }  
  class b{  
 
  public void max(){ 	
	System.out.println("i"); 
  }
}
}

error :nonstatic variable this cannot be referenced from a static context b j=new b ,idk what to do. if u write code,i will be able to understand what is required.

**Norm** · June 21st, 2012, 10:19 AM

Please copy the exact text of the error message. I do no understand the error message you posted.
Please copy full text of error message and paste it here. Here is a sample:

TestSorts.java:138: cannot find symbol
symbol  : variable var
location: class TestSorts
         var = 2;
         ^

**dipakshah8944** · June 21st, 2012, 10:50 AM

class a{
 public static void main(String args[]){ 
	int i=10;
	b j=new b();
	j.max();
	System.out.println(i); 
	System.out.println(j);
 
  }  
  class b{  
 
  public void max(){ 
	System.out.println("i"); 
  }
}
}

C:\Documents and Settings\dipak\Desktop>javac a.java
a.java:4: error: non-static variable this cannot be referenced from a static con
text
b j=new b();
^
1 error

C:\Documents and Settings\dipak\Desktop>

**Norm** · June 21st, 2012, 11:05 AM

Make the class b static by adding static before the word class:
static class b {

**dipakshah8944** · June 21st, 2012, 11:33 AM

[code=java]
class a{
public static void main(String args[]){
int i=10;
b j=new b();
j.max();
System.out.println(i);
System.out.println(j);

}
static class b{

public void max(){
System.out.println("i");
}
}
}
[\code]

C:\Documents and Settings\dipak\Desktop>javac a.java

C:\Documents and Settings\dipak\Desktop>java a
i
10
a$b@cac268

C:\Documents and Settings\dipak\Desktop>

**dipakshah8944** · June 21st, 2012, 11:36 AM

class a{
public static void main(String args[]){
int i=10;
b j=new b();
j.max();
System.out.println(i);
System.out.println(j);
 
}
static class b{
 
public void max(){
System.out.println("i");
}
}
}

C:\Documents and Settings\dipak\Desktop>javac a.java

C:\Documents and Settings\dipak\Desktop>java a
i
10
a$b@cac268

C:\Documents and Settings\dipak\Desktop>

**Norm** · June 21st, 2012, 11:37 AM

Have you got it working now?

**dipakshah8944** · June 21st, 2012, 11:56 AM

yes, but i m still confused. can u explain?

**dipakshah8944** · June 21st, 2012, 11:59 AM

confused abt last line output

**copeg** · June 21st, 2012, 12:15 PM

Thread moved from Member Introductions
Please read the forum rules and in the future post questions in the most appropriate category.

**dipakshah8944** · June 21st, 2012, 12:19 PM

where can we select categories?

**Norm** · June 21st, 2012, 12:22 PM

a$b@cac268

That is from:
System.out.println(j);
It's what is returned from the default toString() method for a class. j is the class reference that was printed.
The a$b is the name of the class. It says that b is an inner ($) class of the a class.
The @ separates the class name from the hashcode (cac268) for the class object.
This information can be useful later when you are debugging a larger program.

**javapenguin** · June 21st, 2012, 12:22 PM

Go to forum and then there should be a bunch of forums. Like What's Wrong with my code? Java Theory and Questions, etc.

Thread: hello

LinkBack

Thread Tools

Display

hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

Re: hello

The Following User Says Thank You to Norm For This Useful Post:

Re: hello