Introduction
The Process
class in Java provides control over native operating system processes. It allows you to execute, manage, and interact with system processes from a Java application.
Table of Contents
- What is the
Process
Class? - Common Methods
- Examples of Using the
Process
Class - Conclusion
1. What is the Process Class?
The Process
class represents a native process started by a Java application. It provides methods to manage the process's lifecycle and interact with its input/output streams.
2. Common Methods
destroy()
: Terminates the process.exitValue()
: Returns the exit value of the process.waitFor()
: Waits for the process to complete.getInputStream()
: Returns the input stream connected to the process's standard output.getOutputStream()
: Returns the output stream connected to the process's standard input.getErrorStream()
: Returns the input stream connected to the process's standard error.
3. Example: Executing a System Command using Process
This example demonstrates how to execute a system command and read its output.
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class ProcessExample {
public static void main(String[] args) {
try {
Process process = Runtime.getRuntime().exec("echo Hello, World!");
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
process.waitFor();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Output:
Hello, World!
4. Conclusion
The Process
class in Java is used for executing and managing system processes from within a Java application. By utilizing its methods, you can interact with native processes, handle their input/output streams, and manage their lifecycle effectively.
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