1int[] primes=newint[]{2,3,5,7,11,13,17,19,23,29}; 2for(intn:primes)System.out.println(n);//这里使用了for-in语句,句法规则如语句所示 就是这么简单,到这里已经讲完了基本的for-in语句,但是我想你还是应该知道后面的一些东西。 一般来说,for-in中的array或者collection不能通过循环变量来修改。
清单15. Iterator 长时间以来一直是 Java 语言的中流砥柱 package java.util; public interface Iterator<E> { public boolean hasNext(); public E next(); public void remove(); } 但是,为了利用 for/in,需要在您的域知识中添加另一个接口 java.lang.Iterable。该接口如清单 16 所示: 清单16. Iterable ...
import java.util.Iterator; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; /** * This class allows line-by-line iteration through a text file. * The iterator's remove() method throws UnsupportedOperatorException. * The iterator wraps and rethrows IOExceptio...
Java 复制 private static Todo readData(Connection connection) throws SQLException { log.info("Read data"); PreparedStatement readStatement = connection.prepareStatement("SELECT * FROM todo;"); ResultSet resultSet = readStatement.executeQuery(); if (!resultSet.next()) { log.info("There is no...
If you are using the 1.x version of java-nats and don't want to upgrade to 2.0.0 please use ranges in your POM file, java-nats-streaming 1.x is using [1.1, 1.9.9) for this. Integration with GraalVM To inlcude this library with a GraalVM project, there are 2 important configuration...
Learn how to create anApache HBaseapplication in Java. Then use the application with HBase on Azure HDInsight. The steps in this document useApache Mavento create and build the project. Maven is a software project management and comprehension tool that allows you to build software, documentation...
The sample programs are intended to be run on the Java Platform, Standard Edition (Java SE) version 6. Where Do You Go from Here? At this point, you have enough information to begin picking your own way through the JAXP libraries. Your next step depends on what you want to accomplish....
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