Thread: Can somebody help me!

look sorry for not being so clearly, I have all the code of application and I know what it does but i dont know what does means those lines that i wrote above, I know its a part for sorting but i dont understand how it goes that , i need an explain .

Okej here is the code :

import javax.swing.JOptionPane; 
 
public class Race { 
 
public static void main(String[] args) { 
final int RUNNERS = 15; 
int[][] racer = new int[RUNNERS][2]; 
 
for (int i=0; i<RUNNERS; i++) { 
racer[i][0] = Integer.parseInt( JOptionPane.showInputDialog( 
"Enter racer ["+(i+1)+"] time in seconds")); 
 
// positions 1 to 15 (unsorted times) 
racer[i][1] = i+1; 
} // end for 
 
// sort array 
for (int i=0; i<RUNNERS; i++) { 
for (int j=i+1; j<RUNNERS; j++) { 
if (racer[j][0]<racer[i][0]) { 
// swap times and positions 
int temp = racer[j][0]; 
int temp2 = racer[j][1]; 
racer[j][0] = racer[i][0]; 
racer[j][1] = racer[i][1]; 
racer[i][0] = temp; 
racer[i][1] = temp2; 
} // end if 
} // end for j 
} // end for i 
 
System.out.printf("Winner: racer with ordinar number %d and time %3d%n", 
racer[0][1], racer[0][0]); 
System.out.printf("Second: racer with ordinar number %d and time %3d%n", 
racer[1][1], racer[1][0]); 
System.out.printf("Third: racer with ordinar number %d and time %3d%n", 
racer[2][1], racer[2][0]); 
 
} // end main() 
 
} // end class Race

program chooses first second and third place on a race, the program needs to accepts mostly 15 racers , after it gets the time of all 15 racer it prints:
winner: racer with ordinar number x and time xxx
second: racer with ordinar number x and time xxx
third: racer with ordinar number x and time xxx

The code is fine, compile it in your pc and u will see, theres nothing before the code executes , its simply 2d array with 15 racer each one with his own time (inputed by JOptionPane) , after gets all the times of racer it prints for example:

winner: racer with ordinar number 4 and time 127
second: racer with ordinar number 11 and time 130
third: racer with ordinar number 2 and time 145

//This application gets 15 racer and chooses first second and third place on a race 
import javax.swing.JOptionPane; 
 
public class Race { 
 
   public static void main(String[] args) { 
      final int RUNNERS = 5; 
      int[][] racer = new int[RUNNERS][2]; 
 
      for (int i=0; i<RUNNERS; i++) { 
         racer[i][0] = Integer.parseInt( JOptionPane.showInputDialog( 
            "Enter racer ["+(i+1)+"] time in seconds")); 
 
      // positions 1 to 15 (unsorted times) 
         racer[i][1] = i+1; 
      } // end for 
 
   // sort array 
      for (int i=0; i<RUNNERS; i++) { 
         for (int j=i+1; j<RUNNERS; j++) { 
            if (racer[j][0]<racer[i][0]) { 
            // swap times and positions 
               int temp = racer[j][0]; 
               int temp2 = racer[j][1]; 
               racer[j][0] = racer[i][0]; 
               racer[j][1] = racer[i][1]; 
               racer[i][0] = temp; 
               racer[i][1] = temp2; 
            } // end if 
         } // end for j 
      } // end for i 
 
      System.out.println("Winner: racer with ordinar number "+ (racer[0][1]) + " and time "+(racer[0][0]));
 
      System.out.println("Second: racer with ordinar number "+ (racer[1][1]) + " and time "+(racer[1][0])); 
 
      System.out.println("Third: racer with ordinar number " + (racer[2][1]) + " and time " + (racer[2][0]));   
   } // end main() 
 
} // end class Race

After compiled & runed outputed:
Winner: racer with ordinar number 5 and time 23
Second: racer with ordinar number 4 and time 34
Third: racer with ordinar number 1 and time34

okej look with that suggestion you give me more imagine what those line does , i will see it to try making even much better than posting again . Thank you so much for the time , sorry that I wasnt so clear .

Hello guys ones again , Im talking for this code again this is an workout that my teacher gives to me, I cant send that code beacuse its to complicated can somebody help me or make it to me that code , workout said:
Write a program that selects first, second and third place of a ski race.
the application accepts mostly 15 skaters. The data of the racers are held on 2d array, first dimension the application needs to save the ordinal number and in the second dimension the time it took to finish the race in seconds via interactive input(JOptionPane) and finally the application shows 3 first places.

I know maybe u cant write it from start for me but if u ll do it u ll save my life , thanks .

The problem is that code its to complicated , i need it more simple, can edit that code above to make it more simple/clearly to understand.

This part sir :

   // sort array 
      for (int i=0; i<RUNNERS; i++) { 
         for (int j=i+1; j<RUNNERS; j++) { 
            if (racer[j][0]<racer[i][0]) { 
            // swap times and positions 
               int temp = racer[j][0]; 
               int temp2 = racer[j][1]; 
               racer[j][0] = racer[i][0]; 
               racer[j][1] = racer[i][1]; 
               racer[i][0] = temp; 
               racer[i][1] = temp2; 
            } // end if 
         } // end for j 
      } // end for i

thats the case i dont even know

There is a very useful comment in the code:

// swap times and positions

So I would guess that this is what the code is doing.

You have a 2-dimensional array here, it is called "racer".
From the given code fragment I would assume that it contains "times" and "positions" of runners.
The code you have shown iterates over all times and positions and apparently "swaps" their values in a certain way.

The result of all this swapping is that the times and positions of all runners are sorted in the end.
You have to figure out now why they are sorted by this.
I would advice you to look at an example with actual numbers and do the algorithm by hand, maybe on a piece of paper, writing down every step of the algorithm one at a time.

If you have problems figuring it out you might want to read up on BubbleSort or other popular sorting algorithms. Last time I checked there were plenty of online tutorials (with animated examples) on the web.

Thanks all of you , U can close this , thanks again cheers