- idea vm参数设置
- 栈溢出(其实就是递归调用没结束)
public static void stackOverFlow(){ stackOverFlow(); }
- 堆溢出
static class TestBean{} /** * * 堆溢出 Java heap space */ public static void outOfMemory(){ try { while (true){ list.add( new TestBean()); } }catch (Exception e){ System.out.println(e); } }
- 运行是常量异常
static List arrayList=new ArrayList(); public static void outOfMemoryPremGen(){ int i=0; while (true){ list.add(String.valueOf(i++).intern()); } }
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Unsafe 分配堆外内存(java nio就是这样实现)
//Unsafe 分配内存 private static final Unsafe unsafe = Unsafe.getUnsafe(); private final static int size=1024*1024; public static void getSyseMmory(){ while (true){ unsafe.allocateMemory(size); } }