死磕内存篇2 --JAVA进程是怎么突然挂掉的

 total used free shared buffers cached 
Mem:      984 119 864 0 2 20 
-/+         buffers/cache: 97 886 
Swap:      2044 45 1999

package org.hejinbin.memory.test;

import java.io.IOException;

/**
 * 用于演示内存不足导致JAVA进程退出, 注意:输入的size勿导致超出int （1024 * 1024 * size）
 * 
 * @author 何锦彬 QQ 277803242（包子） 2016.12.29
 */
public class Test {
    public static void main(String[] args) throws IOException, InterruptedException {

        new Thread(new Runnable() {

            public void run() {

                try {
                    //接收测试内存的大小,单位m
                    byte[] byteSize = new byte[50];
                    System.out.print("input want to allocation memory:");
                    int temp = System.in.read(byteSize);
                    String sizeStr = new String(byteSize, 0, temp);
                    int size = Integer.parseInt(sizeStr.trim());
                    System.out.println(1024 * 1024 * size);
                    byte[] bt = new byte[1024 * 1024 * size];
                    System.out.println("succ..allocation: " + size + "m");
                    //阻30分,防止垃圾回收
                    Thread.sleep(1000 * 60 * 30);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        }).start();

        while (true) {
            //1分钟后报告
            Thread.sleep(1000 * 60);
            System.out.println(Thread.currentThread().getId() + ": i‘m alive");
        }
    }
}