import java.lang.management.ManagementFactory;

import java.lang.management.MemoryMXBean;

import java.lang.management.OperatingSystemMXBean;

import java.util.Map;

import java.util.Properties;

public class ShowJvmProperties {

public static void main(String[] args) {

Properties properties = System.getProperties();

// for (Map.Entry entry : properties.entrySet()) {

// System.out.println(entry.getKey() + " " + entry.getValue());

// }

//

// properties.forEach((key, value) -> System.out.println(key + "\t" + value));

// outputEnv();

// outputSystemMemory();

// outputMemoryFromMXBean();

outputOperatingSystemInfo();

}

private static void outputEnv() {

Map<String, String> env = System.getenv();

env.forEach((key, value) -> System.out.println(key + "\t" + value));

}

private static void outputSystemMemory() {

Runtime runtime = Runtime.getRuntime();

long freeMemory = runtime.freeMemory();

long maxMemory = runtime.maxMemory();

long totalMemory = runtime.totalMemory();

System.out.println("Memory: free " + freeMemory + "\tmax\t" + maxMemory + "\ttotal\t" + totalMemory);

}

private static void outputMemoryFromMXBean() {

MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();

System.out.println("Heap memory usage " + ((MemoryMXBean) memoryMXBean).getHeapMemoryUsage());

}

private static void outputOperatingSystemInfo() {

OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();

String name = operatingSystemMXBean.getName();

String version = operatingSystemMXBean.getVersion();

String arch = operatingSystemMXBean.getArch();

int availableProcessors = operatingSystemMXBean.getAvailableProcessors();

double systemLoadAverage = operatingSystemMXBean.getSystemLoadAverage();

System.out.println("OS: " + name + " " + version);

System.out.println("Architecture: " + arch + " processors: " + availableProcessors);

System.out.println("Current load average: " + systemLoadAverage);

}

}