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数据库数据在Java占用内存简单估算(二)
2014-11-24 00:41:07 来源: 作者: 【 】 浏览:33
Tags:数据库数据 Java 占用 内存 简单 估算
f will not compute final fields //SizeOf.skipFlyweightObject(true); //java.sizeOf will not compute well-known flyweight objects } public static void main(String[] args) throws SQLException, IOException, IllegalAccessException { TestSize ts=new TestSize(); ts.testObjectSize(); ts.testDataSize(); System.out.println("ok"); } public void testObjectSize() { System.out.println("Integer:"+SizeOf.deepSizeOf(new Integer(56))); System.out.println("Long:"+SizeOf.sizeOf(new Long(56L))); System.out.println("Object:"+SizeOf.sizeOf(new Object())); System.out.println("Date:"+SizeOf.sizeOf(new Date())); System.out.println("Timestamp:"+SizeOf.sizeOf(new Timestamp(System.currentTimeMillis()))); System.out.println("String_0:"+SizeOf.deepSizeOf(new String())); System.out.println("String_1:"+SizeOf.deepSizeOf(new String("1"))); System.out.println("String_10:"+SizeOf.deepSizeOf(new String("0123456789"))); System.out.println("String_100:"+SizeOf.deepSizeOf("0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789")); System.out.println("StringBuilder:"+SizeOf.deepSizeOf(new StringBuilder())); System.out.println("BigDecimal:"+SizeOf.deepSizeOf(new BigDecimal("34535643.23"))); System.out.println("BigInteger:"+SizeOf.deepSizeOf(new BigInteger("34535643"))); System.out.println("HashMap:"+SizeOf.deepSizeOf(new HashMap())); System.out.println("HashMap_0:"+SizeOf.deepSizeOf(new HashMap(0))); System.out.println("HashMap_100:"+SizeOf.deepSizeOf(new HashMap(100))); System.out.println("HashMap_10000:" + SizeOf.deepSizeOf(new HashMap(10000))); System.out.println("ArrayList:"+SizeOf.deepSizeOf(new ArrayList())); System.out.println("ArrayList_0:"+SizeOf.deepSizeOf(new ArrayList(0))); System.out.println("ArrayList_100:"+SizeOf.deepSizeOf(new ArrayList(100))); System.out.println("ArrayList_10000:"+SizeOf.deepSizeOf(new ArrayList(10000))); System.out.println("LinkedList:"+SizeOf.deepSizeOf(new LinkedList())); System.out.println("LinkedHashMap:"+SizeOf.deepSizeOf(new LinkedHashMap())); System.out.println("ClassA:" + SizeOf.deepSizeOf(new ClassA())); System.out.println("ClassB:"+SizeOf.deepSizeOf(new ClassB())); System.out.println("ClassC:"+SizeOf.deepSizeOf(new ClassC())); } public void testDataSize() throws IOException, IllegalAccessException { HashMap hm=new HashMap(); System.out.println("HashMap_empty:"+SizeOf.deepSizeOf(hm)); hm.put("id", 1988); hm.put("createTime", new Date()); hm.put("modifyTime", new Date()); hm.put("name", "张三丰"); hm.put("address","浙江杭州市西湖大道188号808室"); hm.put("age",88); hm.put("weight",new BigDecimal(88)); hm.put("height",new BigDecimal(188)); hm.put("phone","1388888888"); System.out.println("HashMap_full:" + SizeOf.deepSizeOf(hm)); Emp emp=new Emp(); System.out.println("Emp_empty:"+SizeOf.deepSizeOf(emp)); emp.setId(1988); emp.setCreateTime(new Timestamp(System.currentTimeMillis())); emp.setModifyTime(new Timestamp(System.currentTimeMillis())); emp.setName("张三丰"); emp.setAddress("浙江杭州市西湖大道188号808室"); emp.setAge(28); emp.setWeight(n
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