java 9 jlink example

is highlighted.If the developer runs the code from the module with the Module-info.java file, IntelliJ idea will automatically use the-p parameter (the module path) instead of the-classpath.IntelliJ idea also provides quick fixes for common problems that occur when migrating code to JPMS, such as adding "require" directives.or automatic detection of duplicate instructions and other errors that can be fixed.Developers can also create module diagrams with IntelliJ idea to visualize the modules th

tests. It is extremely difficult to compile a good microbenchmark test. The Java platform is very complex, and many micro-benchmark tests can only be used to measure the instantaneous effect, or other unexpected aspects of the Java platform. For example, if you have no experience, a microbenchmark is usually a test of the time or garbage collection, but you do n

collection class without providing its type, the compiler will prompt the warning "unchecked warning". Usually when this happens, we need to find the code that caused the warning. If it does indicate an error, we need to correct it. For example, if the warning message indicates that the switch statement in our code does not overwrite all possible case, then we should add a default instance to avoid this warning.Sometimes we cannot avoid this warning,

1. Translating Java Classes to Scala ClassesExample 1:inch Javapublic class book{}# Scala equivalent of a class Declarationclass bookExample 2:# A Java class with a Construtorpublic class book{ int ISBN; Private final String title; Public book (int ISBN, String title) { = ISBN; = title; } int GETISBN () { return ISBN; } Public String GetTitle () { retu

a Java micro-benchmark test," he said.Writing good micro-benchmark tests is extremely difficult. The Java platform is very complex, and many micro-benchmarks can only be used to measure instantaneous effects, or other unexpected aspects of the Java platform.For example, if you have no experience, a micro-benchmark tes

); - stsm.executeupdate (); - in //5: Set save point -one = Conn.setsavepoint ("One"); to + //perform a second transfer of money -STSM =conn.preparestatement (TWO1); the stsm.executeupdate (); *STSM =conn.preparestatement (TWO2); $ stsm.executeupdate ();Panax Notoginseng -}Catch(Exception e) { the //6: If there is an error in the statement, roll back to save point + Try { A Conn.rollback (one); the}Catch(Exception E1) { + e1.printstackt

NullPointerException, everyone should have seen it. This is the idea of a null reference proposed by Tony Hoare in designing the Algol W language, and is designed to ensure that all references are absolutely secure by using a compiler's automatic detection mechanism. Many years later, he regretted the decision he had made, calling it "My big mistake of millions." The consequence of this is---we want to judge a field in an object to check, and we see that we are not looking at an object, but rath

Summary:introduce the collection feature of Java. Includes Set. List and Queue-collection interface only define some basic common functions for all kinds of collections, Includs:Boolean Add (E), remove (E), contains (e),int size (),-collection can easily convert RO array as the example bellow:Public object[] ToArrayCollection -iterator very often used in Java as

method, such as the Print method in this example, does not throw a null pointer exception, but gracefully exits. It is recommended to use a null-safe method if the business logic allows it.9) You can use the = = or! = action to compare null values, but you cannot use other algorithms or logical operations, such as less than or greater than. Unlike SQL, null==null in Ja