JAVA内存异常简单实例

JAVA内存异常实例

1.java堆溢出OutOfMemoryError

import java.util.ArrayList;

import java.util.List;

/*

* VM Args: -Xms20m -Xmx20m -XX:+HeapDumpOnOutOfMemoryError

*/

public class HeapOOM {

static class OOMObject{

}

public static void main(String[] args) {

List<OOMObject> list = new ArrayList<OOMObject>();

while(true){

list.add(new OOMObject());

}

}

}

2.虚拟机栈和本地方法溢出

/*

* VM Args: -Xss128k

*/

public class JavaVMStackSOF {

private int stackLength = 1;

public void stackLeak(){

stackLength++;

stackLeak();

}

public static void main(String[] args) throws Throwable {

JavaVMStackSOF com = new JavaVMStackSOF();

try {

com.stackLeak();

} catch (Exception e) {

System.out.println("stack length:" +

com.stackLength);

throw e;

}

}

}

3.运行时常量溢出

import java.util.ArrayList;

import java.util.List;

import java.util.ArrayList;

import java.util.List;

/*

* VM Args: -XX:PermSize=10M -XX:MaxPermSize=10M

*/

public class RuntimeConstantPoolOOM {

public static void main(String[] args) {

List<String> list = new ArrayList<String>();

int i = 0;

while(true){

//System.out.println("***i:" + i++);

list.add(String.valueOf(i++).intern());//不加intern这个方法就不会把字符串放到常量池

}

}