How to open notepad using java program

• Notepad is a text editor from windows operating system. We use notepad for writing text files.
• We can open a new notepad using java code.
• By using the concept of running another application by Runtime class in java.
• By creating object of runtime and calling  exec() method by passing application name.
• Lets see how to open a notepad using java code

Program #1: Java example program to open notepad

1. package interestingJavaprograms;
2. import java.io.IOException;
3.  
4. public class NotepadJava {
5.  
6.     /**
7.      * @ www.instanceofjava.com
8.      * @ how to open a new notepad using java program
9.      */
10. public static void main(String[] args) {
11.        
12.           Runtime rt = Runtime.getRuntime();
13.           
14. try {
15.       rt.exec("notepad");
16. }
17.  catch (IOException ex) {
18.  
19.  System.out.println(ex);
20.  
21. }  
22.  
23. }
24.  
25. }

 Output:

Program #2: Java example program to open notepad and after 2 seconds close it.

1. package interestingJavaprograms;
2. import java.io.IOException;
3.  
4. public class NotepadJava {
5.  
6.     /**
7.      * @ www.instanceofjava.com
8.      * @ how to open a new notepad using java program
9.      */
10. public static void main(String[] args) throws InterruptedException, IOException {
11.         
12. Runtime runTime = Runtime.getRuntime();
13. System.out.println("Opening notepad");
14. Process process = runTime.exec("notepad");
15.           
16. try {
17.  
18.  
19. Thread.sleep(200); 
20. 
    
21.  process.destroy();
22.  System.out.println("Closing notepad");
23.  
24. }
25.  catch (Exception ex) {
26.  
27.  System.out.println(ex);
28.  
29. }  
30.  
31. }
32.  
33. }

• We can open already existing notepad also for that we need to specify notepad.exe location and path of the destination file.
• We need to pass these two parameters  to exec method of runtime class.
• runTime.exec("C:\\Windows\\System32\\notepad.exe E:\\Samplenotepad.txt");

Program #3: Java example program to open exiting notepad txt file.

1. package interestingJavaprograms;
2. import java.io.IOException;
3.  
4. public class NotepadJava {
5.  
6.     /**
7.      * @ www.instanceofjava.com
8.      * @ how to open a new notepad using java program
9.      */
10. public static void main(String[] args) {
11.        
12.           Runtime rt = Runtime.getRuntime();
13.           
14. try {
15.    runTime.exec("C:\\Windows\\System32\\notepad.exe E:\\Samplenotepad.txt");
16. }
17.  catch (IOException ex) {
18.  
19.  System.out.println(ex);
20.  
21. }  
22.  
23. }
24.  
25. }