Java 8 is a giant step forward for the Java language. Writing this book has forced me to learn a lot more about it. In Project Lambda, Java gets a new closure syntax, method-references, and default methods on interfaces. It manages to add many of the features of functional languages wit...
One example of inner interface used in java standard library is java.util.Map and Java.util.Map.Entry. Here java.util.Map is used also as a namespace. Entry does not belong to the global scope, which means there are many other entities that are Entries and are not necessary Map's entr...
We want client code to be able to follow the standard Java naming conventions we all know. That isfoo = p.getX()andp.setX(2.3)should work. We want client code to be able to follow the standard Java naming conventions we all know. That isfoo = p.xandp.x = 2.3should also work, a...
add(capture<? extends Foo>) in List cannot be applied toadd(Foo) The compiler says: cannot find symbol symbol : methodaddAll(java.util.List<capture#692of ? extends Foo>)location:interfacejava.util.List<capture#128of ?extendsFoo> error 2: IntelliJ gives me addAll(java.util.Collection<?ext...
Then, you programmatically start the server in-code, as shown in Listing 1. Listing 1. Embedded Tomcat package foo; import java.io.File; import org.apache.catalina.WebResourceRoot; import org.apache.catalina.core.StandardContext; import org.apache.catalina.startup.Tomcat; import org.apache....
What is PHP? What is debugging? What is the error and why is there an error in the code below? public class XYZ { public static final int A = 9; public abstract void foo1( ); public int foo2( ) { return 5; } } What is a command line parameter?
476 |-WARN in ch.qos.logback.classic.LoggerContext[default] - Resource [logback.xml] occurs at [jar:file:/Users/pdai/apache-shardingsphere-elasticjob-3.0.1-lite-ui-bin/lib/shardingsphere-elasticjob-lite-ui-backend-3.0.1.jar!/logback.xml] 20:20:30,588 |-INFO in ch.qos.logback.classic....
So as of 4.3, you no longer need to specify an explicit injection annotation in such a single-constructor scenario. This is particularly elegant for classes which do not carry any annotations at all: publicclassFooService{privatefinalFooRepository repository;publicFooService(FooRepository repository){...
When Python looks up a key foo in a dict, it first computes hash(foo) (which runs in constant-time). Since in Python it is required that objects that compare equal also have the same hash value (docs here), 5, 5.0, and 5 + 0j have the same hash value. >>> 5 == 5.0 == ...
'TRY_CONVERT' is not a recognized built-in function name 'VARCHAR' is not a recognized built-in function name. 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. "EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for ident...