import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.CountDownLatch;

/**

 * Created by 菩提树下的杨过 on 05/09/2017.

 */

public class OOMTest {

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

        CountDownLatch latch = new CountDownLatch(1);

        int max = 10000;

        List<Person> list = new ArrayList<>(max);

        for (int j = 0; j < max; j++) {

            Person p = new Person();

            p.setAge(100);

            p.setName("菩提树下的杨过");

            list.add(p);

        }

        System.out.println("ready!");

        latch.await();

    }

    public static class Person {

        private String name;

        private int age;

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public int getAge() {

            return age;

        }

        public void setAge(int age) {

            this.age = age;

        }

    }

}　　

using thread-local object allocation.

Parallel GC with 4 thread(s)  //当前使用的GC方式(并行GC)

Heap Configuration:  //堆内存配置

   MinHeapFreeRatio         = 0   //对应jvm启动参数-XX:MinHeapFreeRatio设置JVM堆最小空闲比率(java8默认0)

   MaxHeapFreeRatio         = 100 //对应jvm启动参数-XX:MaxHeapFreeRatio设置JVM堆最大空闲比率

   MaxHeapSize              = 8388608 (8.0MB) //对应jvm启动参数-XX:MaxHeapSize=设置JVM堆的最大大小(或-Xmx参数)

   NewSize                  = 5242880 (5.0MB) //对应jvm启动参数-XX:NewSize=设置JVM堆的‘新生代’的默认

   MaxNewSize               = 5242880 (5.0MB) //对应jvm启动参数-XX:MaxNewSize=设置JVM堆的‘新生代’的最大大小

   OldSize                  = 3145728 (3.0MB) //对应jvm启动参数-XX:OldSize=设置JVM堆的‘老生代’的大小

   NewRatio                 = 2 //对应jvm启动参数-XX:NewRatio=:‘新生代’和‘老生代’的大小比率

   SurvivorRatio            = 8 //对应jvm启动参数-XX:SurvivorRatio=设置年轻代中Eden区与Survivor区的大小比值

   MetaspaceSize            = 21807104 (20.796875MB)

   CompressedClassSpaceSize = 1073741824 (1024.0MB)

   MaxMetaspaceSize         = 17592186044415 MB

   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage: //堆内存使用情况

PS Young Generation

Eden Space: //Eden区分布

   capacity = 2621440 (2.5MB) //Eden区总容量

   used     = 2328088 (2.2202377319335938MB) //Eden区已使用

   free     = 293352 (0.27976226806640625MB) //Eden区剩余容量

   88.80950927734375% used

From Space: //其中一个Survivor区的内存分布

   capacity = 1572864 (1.5MB)

   used     = 360448 (0.34375MB)

   free     = 1212416 (1.15625MB)

   22.916666666666668% used

To Space: //另一个Survivor区的内存分布

   capacity = 1048576 (1.0MB)

   used     = 0 (0.0MB)

   free     = 1048576 (1.0MB)

   0.0% used

PS Old Generation //当前的Old区内存分布

   capacity = 3145728 (3.0MB)

   used     = 1458968 (1.3913803100585938MB)

   free     = 1686760 (1.6086196899414062MB)

   46.37934366861979% used

3759 interned Strings occupying 298824 bytes.

import java.util.concurrent.CountDownLatch;

/**

 * Created by 菩提树下的杨过 on 05/09/2017.

 */

public class OOMTest {

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

        CountDownLatch latch = new CountDownLatch(1);

        int max = 100;

        for (int i = 0; i < max; i++) {

            Thread t = new Thread() {

                public void run() {

                    try {

                        Thread.sleep(50);

                    } catch (InterruptedException e) {

                        Thread.currentThread().interrupt();

                    }

                }

            };

            t.setName("thread-" + i);

            t.start();

        }

        Thread t = new Thread() {

            public void run() {

                int i = 0;

                while (true) {

                    i = (i++) / 10;

                }

            }

        };

        t.setName("BUSY THREAD");

        t.start();

        System.out.println("ready");

        latch.await();

    }

}

import java.util.ArrayList;

import java.util.List;

/**

 * Created by 菩提树下的杨过 on 05/09/2017.

 */

public class OOMTest {

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

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

        while (true) {

            Thread.sleep(10);

            list.add("菩提树下的杨过" + System.currentTimeMillis());

        }

    }

}