Java是一門被廣泛使用的編程語言，而內(nèi)存泄漏和GC（垃圾回收）問題是Java開發(fā)中最為常見的問題之一。監(jiān)控內(nèi)存和GC是有效解決這些問題的關(guān)鍵。

// 監(jiān)控內(nèi)存
public static void main(String[] args) {
MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
MemoryUsage memoryUsage = memoryMXBean.getHeapMemoryUsage();
long usedMemory = memoryUsage.getUsed() / 1024 / 1024;
long maxMemory = memoryUsage.getMax() / 1024 / 1024;
System.out.println("Used memory: " + usedMemory + " MB");
System.out.println("Max memory: " + maxMemory + " MB");
}
// 監(jiān)控GC
public static void main(String[] args) {
ListgcMxBeans = ManagementFactory.getGarbageCollectorMXBeans();
for (GarbageCollectorMXBean gcMxBean : gcMxBeans) {
String name = gcMxBean.getName();
long count = gcMxBean.getCollectionCount();
long time = gcMxBean.getCollectionTime();
System.out.println("GC Name: " + name);
System.out.println("GC Count: " + count);
System.out.println("GC Time: " + time + " ms");
}
}

通過以上代碼我們可以輕松地得知Java程序運(yùn)行時(shí)內(nèi)存的使用情況和GC的執(zhí)行情況。這些監(jiān)控?cái)?shù)據(jù)對(duì)于調(diào)試和優(yōu)化程序非常有幫助。