remove(Object key)、 remove(Object key, Object value):移除指定key对应的元素/指定key对应的键值。 Set entrySet()、Set keySet():返回Map集合中所有键值对的 Set 集合/返回 Map 集合中所有键对象的 Set 集合 clear()、isEmpty()、size()、Collection values():返回Map中所有 value 组成的 Collection 5、案...
The updater methods are used to update column values in the current row or the insert row. The updater methods do not update the underlying database; instead the updateRow or insertRow methods are called to update the database. Added in 1.6. Java documentation for java.sql.ResultSet.updateN...
java.util.Date myDate = new java.util.Date(); int currentDay = myDate.getDay(); The methodjava.util.Date.getDayhas been deprecated since JDK 1.1. dep-ann Warns about items that are documented with the@deprecatedJavadoc comment, but don’t have the@Deprecatedannotation, for example: ...
MyBatis：一个用于 Java 应用的持久层框架，它提供了简化的 SQL 映射和事务管理。MyBatis 支持自定义 ...
Set<Object> objects = Sets.newHashSetWithExpectedSize(objectsNum);for(inti =0; i < objectsNum; i++) { objects.add(newObject()); } Iterable<?> locks = striped.bulkGet(objects); assertTrue(Ordering.natural().onResultOf(Functions.forMap(indexByLock)).isOrdered(locks));// check idemp...
public class User<T> { private T[] values; public User(T[] values) { //错误,不能实例化元素类型为类型参数的数组 this.values = new T[5]; //正确,可以将values 指向类型兼容的数组的引用 this.values = values; }}复制代码 5.5 对泛型异常的限制 泛型类不能扩展 Throwable,意味着不能创建泛型异...
初始化数组:array = new int[5]; 或者 int[] array = {1, 2, 3, 4, 5}; 问:如何获取数组的长度? 答:可以使用数组的length属性获取数组的长度,例如:int length = array.length; 问:如何访问数组中的元素? 答:可以使用索引来访问数组中的元素,索引从0开始,例如:int element = array[0]; ...
setCacheCriteria( ) Stores AppLogic results, such as HTML, data values, and streamed results, in a result cache. setSessionVisibility( ) Sets the session visibility. setVariable( ) Sets a value that is passed to later AppLogic requests that are called by the same client session. skipCa...
and as such invoking thesetBackground()method with a non-opaque color will result in anUnsupportedOperationExceptionexception. This does not affect new applications that set a non-opaque color deliberately because the code should first verify that the effect is supported by invoking theGraphicsDevice...
Neither accesses nor modifications can be guarded against, and newly set values cannot be validated. Fields with subclassable types may be set to objects with unsafe or malicious implementations. Always declare public static fields as final. If using an interface instead of a class, the modifiers...