小编set*_*ora的帖子

考虑这个示例类,

class TargetClass {
    private static String SENSITIVE_DATA = "sw0rdfish";

    private static String getSensitiveData() {
        return SENSITIVE_DATA;
    }
}

当我这样做时,

import java.lang.reflect.Method;

public class ClassPiercing {

    public static void main(String... args) throws Exception {
        Class targetClass = Class.forName("TargetClass");
        Method[] methods = targetClass.getDeclaredMethods();
        methods[0].setAccessible(true);
        String sensitiveData = (String)methods[0].invoke(null, null);
        System.out.println("Sensitive Data: " + sensitiveData);
    }
}

输出是,

Sensitive Data: sw0rdfish

这很危险.我该如何防止这种情况发生？

我知道应该在静态环境中访问睡眠.但是我需要更多的输入,所以我可以向管理层辩护.我正在处理的大多数遗留代码现在使用新的Thread().sleep而不是Thread.sleep.

这有多糟糕？

for (int c = 0; c < 5; c++) {
    new Thread().sleep(5000);
}

与此相比？

for (int c = 0; c < 5; c++) {
    Thread.sleep(5000);
}

编辑:

    final long start = System.currentTimeMillis();
    System.out.println("Total memory: " + Runtime.getRuntime().totalMemory());
    System.out.println("Free memory: " + Runtime.getRuntime().freeMemory());
    System.out.println("===========================");
    for (int c = 0; c < 5; c++) {
        new Thread().sleep(5000);
        System.out.println("Used memory: " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()));
        System.out.println("===========================");
    }
    System.out.println("Total memory: " + Runtime.getRuntime().totalMemory());
    System.out.println("Free memory: " + Runtime.getRuntime().freeMemory());
    System.out.println("===========================");
    System.out.println("Time elapsed: " …

我在String的ArrayList中没有特定顺序的这些字符串但是当我调用Collections.sort(listReference)时,排序的结果是不正确的,为什么10和11(最后2个字符)在07,08,09之前出现？

12880  20090506054200001
12880  20090506054200002
12880  20090513070200003
12880  20090513070200004
12880  20090520202600005
12880  20090520202600006
12880  20090520232900010
12880  20090520232900011
12880  20090520232900007
12880  20090520232900008
12880  20090520232900009

包含哈瓦那(UTF-8)的XML被发送到服务A.

服务A将其发送给服务B.

该字符串被编码为å"ç"|é,£(ISO-8859-1).

我怎么把它编码回哈瓦那？考虑到Java中的所有字符串都是UTF-16.服务B必须将其比作哈瓦那不是å"ç"|é,£.

谢谢.

这是一个Java问题.

将a转换List<?>为a 的最快方法是List<ObjectType>什么？我知道这可以通过迭代,请排除该选项.

迭代的例子,

final List<ObjectType> targetList = new ArrayList<ObjectType>();
// API returns List<?> so I have no choice.
List<?> resultList = resultSet.getResults(); 

// This is slow. Average list size is 500,000 elements.
while (resultList != null && !resultList.isEmpty()) {
    for (final Object object : resultList) {
        final ObjectType objectType = (ObjectType) object;
        targetList.add(objectType);
    }
    resultSet = someService.getNext(resultSet);
    resultList = resultSet.getList();
}

谢谢.

我已经为以下所有设置了一致的命名空间(http://somenamespace.com/2012/10/):

1. Service Contract名称空间
2. 服务命名空间
3. Data Contract命名空间
4. 绑定命名空间

但是我在服务日志(.svclog)文件上收到此错误.有人可以开导我这个吗？我已经咨询了几个网站,但无济于事.

这是一个很好的参考:http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/ee11d86f-f25c-4284-8f51-b1f035346cb3/

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
<System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
<EventID>131074</EventID>
<Type>3</Type>
<SubType Name="Error">0</SubType>
<Level>2</Level>
<TimeCreated SystemTime="2013-01-04T06:57:48.7620812Z" />
<Source Name="System.ServiceModel" />
<Correlation ActivityID="{eadc96c2-323f-41df-bc3d-df56367dda52}" />
<Execution ProcessName="w3wp" ProcessID="2088" ThreadID="54" />
<Channel />
<Computer>SOMECOMPUTER007</Computer>
</System>
<ApplicationData>
<TraceData>
<DataItem>
<TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Error">
<TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Diagnostics.EventLog.aspx</TraceIdentifier>
<Description>Wrote to the EventLog.</Description>
<AppDomain>/LM/W3SVC/1/ROOT/SomeApplication-1-130017541311895789</AppDomain>
<ExtendedData xmlns="http://schemas.microsoft.com/2006/08/ServiceModel/DictionaryTraceRecord">
<CategoryID.Name>EventLogCategory</CategoryID.Name>
<CategoryID.Value>7</CategoryID.Value>
<InstanceID.Name>EventId</InstanceID.Name>
<InstanceID.Value>3221356549</InstanceID.Value>
<Value0>System.ArgumentException: The 'http://somenamespace.com/2012/10/' namespace is not defined.
   at System.Xml.XmlWriter.WriteQualifiedName(String localName, String ns)
   at System.Runtime.Serialization.XmlWriterDelegator.WriteAttributeQualifiedName(String attrPrefix, XmlDictionaryString attrName, XmlDictionaryString attrNs, XmlDictionaryString name, XmlDictionaryString ns) …