Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.io.FileFilter;

import java.util.regex.Pattern;

public class Main {
    public final static int getNumCores() {
        // Private Class to display only CPU devices in the directory listing
        class CpuFilter implements FileFilter {
            @Override
            public boolean accept(File pathname) {
                // Check if filename is "cpu", followed by a single digit number
                if (Pattern.matches("cpu[0-9]", pathname.getName())) {
                    return true;
                }
                return false;
            }
        }
        try {
            // Get directory containing CPU info
            File dir = new File("/sys/devices/system/cpu/");
            // Filter to only list the devices we care about
            File[] files = dir.listFiles(new CpuFilter());
            // Return the number of cores (virtual CPU devices)
            return files.length;
        } catch (Exception e) {
            return Runtime.getRuntime().availableProcessors();
        }
    }
}