Digital Watch program and Sorting arrays

**c.P.u1** · February 4th, 2011, 07:30 AM

class time{
    public static void main(String args[])
            {
        for(int h=0;h<=24;h++)
        {
            for(int m=0;m<=60;m++)
            {
                for(int s=0;s<=60;s++)
                {
                  try
      {
        Thread.sleep(1000);        
 
            }catch (InterruptedException ie)
            {
        System.out.println(ie.getMessage());
            }                   
 
                System.out.println(h+":"+m+":"+s);
            }
 
            }
        }
    }
}

The program is correct but i want the screen to be cleared after every time it displays... i searched a lot for a statement which would clear the screen but i dint find any relevant result... i use command prompt for compiling and running java programs...

The second program is

class Sorting{
    public static void main(String args[]){
        int a[]={5,4,9,3,6,2};
        int b=a.length;
        for(int i=0;i<b;i++){
            if(a[i]>a[i+1]){
              int temp=a[i];
              a[i]=a[i+1];
              a[i+1]=temp;
            }
        }
         for(int i=0;i<b;i++)
        System.out.println(a[i]+"\t");
    }
 
}

it compiles well but while running the class file the compiler issues the following warning

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 6
        at Sorting.main(Sorting.java:6)

**DanBrown** · February 4th, 2011, 07:36 AM

its an run time exception.thats why it compiles fine.

if(a[i]>a[i+1]){

my dear what will happen in this case

when i=5

then a[i+1] will refer to position a[6], which is not available in your array.

so it will give you

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 6
at Sorting.main(Sorting.java:6)

**DanBrown** · February 4th, 2011, 08:23 AM

the screen to be cleared after every time it displays... i

when i read this question , my first attempt is to try to print the new time at (x,y) position, i tried this but no result.Then i fell we can execute dos command using

String cmd[] = new String[3];
cmd[0] = "command.com" ;
cmd[1] = "/c";
cmd[2] = "cls";
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(cmd);

i am again fail, i google it and find that the above code will work for win9x only.

**c.P.u1** · February 4th, 2011, 09:33 AM

Originally Posted by DanBrown

its an run time exception.thats why it compiles fine.

my dear what will happen in this case

when i=5

then a[i+1] will refer to position a[6], which is not available in your array.

so it will give you

thanks bro.. i corrected that part...

and for the second program, i have read that we need to use new lines for the output to get on the first line again... any idea about that?

**DanBrown** · February 5th, 2011, 01:35 AM

i have read that we need to use new lines for the output to get on the first line again... any idea about that?

for(int i=0;i<25 ;i++)
{
           System.out.println("");
}

when i m searching for this , some programmers are also working like this.
our command prompt is divided into 25 rows and 80 columns
so they are moving to 25 lines so that start again from the first line.

Hope you are asking for this technique.

**Brt93yoda** · February 5th, 2011, 02:24 AM

String cmd[] = new String[3];
cmd[0] = "command.com" ;
cmd[1] = "/c";
cmd[2] = "cls";
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(cmd);

I think you have to use cmd.exe not command.com.
try this

String[] cmd = {
    "cmd.exe",
    "cls"
};
Runtime.getRuntime().exec(cmd);

**DanBrown** · February 5th, 2011, 05:21 AM

I had tried both , but not working.

**Brt93yoda** · February 5th, 2011, 05:49 AM

In linux I just do Runtime.getRuntime().exec("clear");

**DanBrown** · February 5th, 2011, 05:53 AM

String[] cmd = {
"cmd.exe",
"cls"
};
Runtime.getRuntime().exec(cmd);

In win 9x and above this will work fine and i don't know the reason why its not running for winxp and above.

**Brt93yoda** · February 5th, 2011, 05:21 PM

I'm sorry, but I can't understand your broken English.

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