OOMTest.java

package study.java.jdks.version1_8.saybyeto_pergen;

import java.io.File;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

public class OOMTest {      
	public static void main(String[] args) {        
		try {             
			//准备url            
			URL url = new File("E:/eclipse_luna/aidefaultws/JavaStudy/bin/study/java/jdks/version1_8/saybyeto_pergen/").toURI().toURL();       
			URL[] urls = {url};            
			//获取有关类型加载的JMX接口           
			ClassLoadingMXBean loadingBean = ManagementFactory.getClassLoadingMXBean();  
			//用于缓存类加载器           
			List<ClassLoader> classLoaders = new ArrayList<ClassLoader>();         
			while (true) {               
				//加载类型并缓存类加载器实例                
				ClassLoader classLoader = new URLClassLoader(urls);      
				classLoaders.add(classLoader);                
				classLoader.loadClass("study.java.jdks.version1_8.saybyeto_pergen.ClassA");                
				//显示数量信息（共加载过的类型数目，当前还有效的类型数目，已经被卸载的类型数目）               
				System.out.println("total: " + loadingBean.getTotalLoadedClassCount());  
				System.out.println("active: " + loadingBean.getLoadedClassCount());    
				System.out.println("unloaded: " + loadingBean.getUnloadedClassCount());    
				}         
			} catch (Exception e) {         
				e.printStackTrace();        
			}      
		} 
}