How to Execute External JAR Files from a Java GUI and Display Progress?

Executing External JARs in a Java GUI

Question:

In a Java GUI program, you want to enable buttons that, when pressed, execute specific JAR files (A.jar and B.jar) and display the execution progress within the GUI. How can you achieve this?

Answer:

To execute external JAR files in a separate process from a Java GUI application, follow these steps:

<code class="java">// Import necessary libraries
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.lang.Process;
import java.lang.Runtime;

// Method to execute a JAR file
public void executeJar(String jarPath) {
    try {
        // Execute the JAR in a separate process
        Process proc = Runtime.getRuntime().exec("java -jar " + jarPath);
        
        // Get the process input and error streams
        InputStream in = proc.getInputStream();
        InputStream err = proc.getErrorStream();
        
        // Use buffered readers to read the output efficiently
        BufferedReader inReader = new BufferedReader(new InputStreamReader(in));
        BufferedReader errReader = new BufferedReader(new InputStreamReader(err));
        
        // Display the output in the GUI
        while (inReader.ready()) {
            String line = inReader.readLine();
            // Display the line in the GUI using appropriate method
        }
        
        while (errReader.ready()) {
            String line = errReader.readLine();
            // Display the line in the GUI using appropriate method
        }
        
        // Close the streams
        inReader.close();
        errReader.close();
    } catch (IOException e) {
        // Handle the IO exception and display an error message in the GUI
    }
}</code>

Call the executeJar() method when your buttons are clicked, passing the respective JAR file paths. This will execute the JAR files and display their output in your GUI.

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