java 获取服务器可用内存

public class MemoryInfo {
    public static void main(String[] args) {
        Runtime runtime = Runtime.getRuntime();

        // 获取JVM最大内存
        long maxMemory = runtime.maxMemory();
        System.out.println("Max Memory: " + maxMemory / 1024 / 1024 + " MB");

        // 获取JVM空闲内存
        long freeMemory = runtime.freeMemory();
        System.out.println("Free Memory: " + freeMemory / 1024 / 1024 + " MB");

        // 获取JVM总内存
        long totalMemory = runtime.totalMemory();
        System.out.println("Total Memory: " + totalMemory / 1024 / 1024 + " MB");

        // 计算可用内存（总内存 - 已用内存）
        long availableMemory = totalMemory - (totalMemory - freeMemory);
        System.out.println("Available Memory: " + availableMemory / 1024 / 1024 + " MB");
    }
}