Why i can't print this array?

[ahmad mayahi]

Hi
Why this code is not working?
I can't set a number to the array!!

 
String[] Str = new String[3];

for (int $i = 0; $i <= Str.length; $i++)
{
	Str[$i] =  $i * $i;
}

System.out.println(Str[0]);

[jittu goud]

well you are trying to assign a integer type to String type ....with out typecasting

[ahmad mayahi]

Is not compiled.
Error is:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
	at myClass.main(myClass.java:21)

[jittu goud]

with the given code only error you should get is ...incompatible types...

may be you have more errors than what you have pasted here...

paste your complete code

[Ulf Dittmer]

Arrays in Java are 0-indexed, not 1-indexed. So an array of length 3 has indexes 0 ... 2, not 1 ... 3.

[W. Joe Smith]

ahmad mayahi wrote:Is not compiled.
Error is:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
	at myClass.main(myClass.java:21)

You have your loop set to $i <= Str.length, which is causing your errror in Str[$i]. Your array index will end at Str.length-1, so when $i = Str.length still goes through the loop Str[$i] will be out of bounds.

EDIT: darn, not fast enough....

[ahmad mayahi]

Complete code:

public class myClass
{

	public static void main(String args[])
	{
	
		String[] Str = new String[3];
		
		
		for (int $i = 0; $i <= Str.length; $i++)
		{
			Str[$i] = "Number Is: " + $i;
		}
		
		System.out.println(Str[0]);
						
	}

}

[W. Joe Smith]

ahmad mayahi wrote:Complete code:

public class myClass
{

	public static void main(String args[])
	{
	
		String[] Str = new String[3];
		
		
		for (int $i = 0; $i <= Str.length; $i++)
		{
			Str[$i] = "Number Is: " + $i;
		}
		
		System.out.println(Str[0]);
						
	}

}

Also, it looks like you are assigning values to the whole array, but are printing just the first value. Not sure if that is what you are planning, just an FYI.

[jittu goud]

for (int $i = 0; $i <= Str.length; $i++)

as said by others the array runs from 0 to n-1

you should say $i < Str.length;

.............

    public class myClass  
    {  
      
        public static void main(String args[])  
        {  
          
           String[] Str = new String[3];  
              
              
           for (int $i = 0; $i < Str.length; $i++)  
           {  
               Str[$i] = "Number Is: " + $i;  
               System.out.println(Str[$i]);  
           }  
             
          
                             
       }  
     
   }  

i guess this is what you wanted to do.... though $i is variable name $ doesnt make any difference to variable....$i or normal 'i' would make the same output

[santhosh.R gowda]

  
public class test
{
	
	
	public static void main(String args[])
	{
		String[] Str = new String[3];   
  
		for (int $i = 0; $i < Str.length; $i++)   
		{   
		    Str[$i] = Integer.toString($i * $i);   
		}   
		  
		System.out.println(Str[0]);  
	
	}
}

or you can also use
Str[$i] = String.valueOf($i * $i);  

  

now the code compiles and runs fine. the error is !) we have to type cast to string 2) Array out of bound is run time error bcz you trying to asign the value to the out of index when you put the index as [3] you can assign only up to 0....2 because array index starts from 0 to length -1

[ahmad mayahi]

Thanks alot :-)