java - 如何从应用程序中准确找到 Java 应用程序使用了多少内存

Question

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Answer 1

如果您专门在 JVM 内存中查找:

Runtime runtime = Runtime.getRuntime();

NumberFormat format = NumberFormat.getInstance();


StringBuilder sb = new StringBuilder();
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();

sb.append("free memory: " + format.format(freeMemory / 1024) + "<br`enter code here`/>");   sb.append("allocated memory: " + format.format(allocatedMemory / 1024) + "<br/>");
sb.append("max memory: " + format.format(maxMemory / 1024) + "<br/>");
sb.append("total free memory: " + format.format((freeMemory + (maxMemory - 
allocatedMemory)) / 1024) + "<br/>");