process-monitor

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process-monitor

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a minimal Java CLI process monitor that lists active processes, tracks resource usage and updates the display every second.

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// repository documentation

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# process-monitor

a simple terminal based process monitor written in Java.  
it refreshes every *1 second* showing:

- PID  
- Process Name  
- CPU Usage %  
- Memory Usage  
- Start Time  
- Overall system CPU + RAM info

you can also kill a process from inside the monitor.

---

## Features

- Live table refresh (1s)
- Sorted by CPU usage
- Clean terminal UI
- Uses Java's `ProcessHandle` API
- Commands:
  - `kill <pid>` -> terminates a process  
  - `quit` -> exits monitor

---

## Project Structure

```
process-monitor/
├── pom.xml
└── src/
     └── main/
         └── java/
             └── monitor/
                 ├── Main.java
                 ├── UI.java
                 ├── ProcessInfo.java
                 ├── ProcessFetcher.java
                 └── SystemStats.java
```

*What each file does:*

- **Main.java**  
  starts the monitor loop, handles user commands, coordinates updates.

- **UI.java**  
  clears the terminal and prints the refreshed table view.

- **ProcessFetcher.java**  
  collects process data using `ProcessHandle` and calculates CPU usage.

- **SystemStats.java**  
  reads system-wide CPU and RAM information.

- **ProcessInfo.java**  
  a simple data holder for each process entry.

---

## Requirements

- Java 17+
- Maven

---

## Note:

- CPU estimation is approximate (Java does not expose raw CPU tick counts)
- RAM usage requires Java 17+ to show per process memory
- Terminal must support ANSI escape codes

process-monitor

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