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IntelliJ IDEA

 

 

配置参数：-Xms34m -Xmx234m

内存初始化大小，最小和最大值；

 

测试代码：

public class JVMDemoTest {    public static void main(String[] args) {        System.out.println("memory info : " + toMemoryInfo());    }    static String toMemoryInfo() {        Runtime runtime = Runtime.getRuntime();        int freeMemory = (int) (runtime.freeMemory() / 1024 / 1024);        int totalMemory = (int) (runtime.totalMemory() / 1024 / 1024);        return freeMemory + "M/" + totalMemory + "M(free/total)";    }}

 

配置参数后运行结果：

memory info : 32M/34M(free/total)

 

默认运行结果：

memory info : 254M/256M(free/total)