1.Preconfitions.checkNotNull(T t)这个是使用Guava中的com.google.common.base.Preconditions进行判断的,因为service中用到的验证较多,所以建议将Preconfitions改成静态导入的方式: 当然Guava的github中的说明也建议我们这样使用。 2.BeanValidators.validateWithException(validator, address); 这个使用了hibernate实现的...
检查器框架(Checker Framework)提供了@NonNull和@Nullable注释，以及可以识别潜在Null Check的编译处理器的步骤。该框架可以通过强制开发人员指定的Nullability，来发现潜在的空值。因此，您的代码必须明确声明可返回的结果为Nullable或NotNullable。下面让我们来看一个可能返回Null，而非String的简单方法：现在，让我们使用检查...
AI代码解释 String somePublicNamespace="CAT";Config config=ConfigService.getConfig(somePublicNamespace);//config instance is singleton for each namespace and is never nullString someKey="someKeyFromPublicNamespace";String someDefaultValue="someDefaultValueForTheKey";String value=config.getProperty(someKe...
AI检测代码解析 importjava.lang.reflect.Field;publicclassEntityUtils{publicstaticbooleancheckFieldsNotEmpty(Objectobj)throwsIllegalAccessException{Class<?>clazz=obj.getClass();Field[]fields=clazz.getDeclaredFields();for(Fieldfield:fields){field.setAccessible(true);Objectvalue=field.get(obj);if(value==nul...
So, accessing any field, method, or index of anullobject causes aNullPointerException, as can be seen from the examples above. A common way of avoiding theNullPointerExceptionis to check fornull: In the real world, programmers find it hard to identify which objects can benull.An aggressivel...
wait_on_cms_lock_for_scavenge(CMSWaitDuration); } else { // Wait until any cms_lock event or check interval not to call shouldConcurrentCollect permanently wait_on_cms_lock(CMSCheckInterval); } // Check if we should start a CMS collection cycle ...
privatestaticUnsafegetUnsafe() {try {Fieldfield=Unsafe.class.getDeclaredField("theUnsafe");field.setAccessible(true);Unsafeunsafe= (Unsafe) field.get(null);returnunsafe; } catch (Exceptione) {e.printStackTrace(); }returnnull;} 拿到这个对象后，调用其中的native方法allocateInstance 创建一个对象...
--retries; // check uncommon case if (tryDeqAndExec(joinMe) >= 0) Thread.yield(); // for politeness } else retries = helpJoinTask(joinMe) ? MAX_HELP : retries - 1; } else { retries = MAX_HELP; // restart if not done pool.tryAwaitJoin(joinMe); } } } join操作类似插队,确保...
println("The string is not null."); } Employing the Objects.isNull() method: In Java 8 and later versions, you can use the Objects.isNull() method from the java.util.Objects class to check if a string is null. This method returns true if the provided object is null; otherwise, it...
name[len] ='\0';char*options =NULL;if(pos !=NULL) { options = os::strdup_check_oom(pos +1, mtArguments); }#if!INCLUDE_JVMTIif(valid_jdwp_agent(name, is_absolute_path)) { jio_fprintf(defaultStream::error_stream(),"Debugging agents are not supported in this VM\n");returnJNI_ER...