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    <p>You got it wrong you need to extend the Thread Class in Ascending and FileCopy.</p> <p>Override the run method and do your operations there. From a third class, or one of those classes implement a main method which creates two threads and calls start() on them, otherwise speaking: </p> <pre><code>//Class FileCopy with a main method package java10; import java.io.File; import java.io.IOException; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileNotFoundException; class FileCopy extends Thread { public static void main(String[] args){ FileCopy fileCopy = new FileCopy(); Ascending ascending = new Ascending(); fileCopy.start(); ascending.start(); ascending.join(); fileCopy.join(); } @Override public void run() { try { File fileIn = new File("C:/Users/dis_YO_boi/Documents/Abhishek.txt"); File fileOut = new File("C:/Users/dis_YO_boi/Documents/Mallela.txt"); FileInputStream streamIn = new FileInputStream(fileIn); FileOutputStream streamOut = new FileOutputStream(fileOut); int c; while ((c = streamIn.read()) != -1) { streamOut.write(c); } streamIn.close(); streamOut.close(); } catch (FileNotFoundException e) { System.out.println("FileCopy: " + e); } catch (IOException e) { System.out.println("FileCopy: " + e); } } } //Class Ascending package java10; public class Ascending extends Thread { @Override public void run(){ int nums[]={-1,23,50,-100,34}; //print the values before ordering for (int i=0;i&lt;nums.length;i++) System.out.println(nums[i]); for(int i=0;i&lt;nums.length-1;i++){ for(int j=i+1;j&lt;nums.length;j++){ if(nums[i]&gt;nums[j]){ int temp=nums[i]; nums[i]=nums[j]; nums[j]=temp; } } } System.out.println("___________________________"); for (int i=0;i&lt;nums.length;i++) System.out.println(nums[i]); } } </code></pre>
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    1. USSam Aleksov
    1. USSam Aleksov
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    1. CO`Ascending` should also implement `Runnable`, or extend `Thread`.
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      1. USafsantos
    2. COLOL, Thanks!!!!
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      1. USSam Aleksov
 

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