java 8 lambda expressions

Original: http://jobar.iteye.com/blog/202347710 examples of lambda expressions in Java8Example 1 implementing the Runnable interface with a lambda expressionJava Code Collection CodeBefore Java 8:New Thread (New Runnable () {@Overridepublic void Run () {System.out.println ("

specify the type. 3 Action dummyLambda = () => 4 { 5 Console.WriteLine("Hello World from a Lambda expression!"); 6 }; 7 8 // Can be used as with double y = square(25); 9 Func From these statements, we can directly understand: If there is only one input parameter, parentheses can be omitted. If there is only one line of statement, and return in this statement, the braces can be omitted, an

); //whether the string matches the regular expression Booleanrs =matcher.matches (); System.out.println (RS);}querying a character or string in a string Public Static voidMain (string[] args) {//the string to validateString str = "Baike.xsoftlab.net"; //Regular Expression RulesString regEx = "baike.*"; //Compiling regular ExpressionsPattern pattern =Pattern.compile (regEx); //Ignore case-written notation//Pattern Pat = pattern.compile (regEx, pattern.case_insensitive);Matcher Matcher =Patter

element in a group of source data. For example, consider the following Delegate types:C # Copy public delegate TResult Func The delegate can be instantiatedFunc, WhereintIs input parameter,boolIs the return value. The return value is always specified in the last type parameter.FuncThe definition contains two input parameters (intAndstring) And the return type isbool. When the followingFuncDuring delegation, the delegate returns true or false to indicate whether the input parameter is equal to 5

code is implemented in C + +: vectorCompared to the implementation of Python, because of the lack of chained calls, it seems that the C + + implementation version does not simplify much of the application logic, but looks slightly cluttered. But this does not prevent us from using lambda expressions where appropriate to optimize our code structure.3. Other languages and

parameter is equal to 5: Func When the parameter type isExpression You can also provide lambda expressions, such as the standard query operators defined in system. LINQ. queryable. If you specifyExpression Parameter, Lambda will compile as the expression directory tree. A standard query operator is displayed here, Method: int[

statement block. · The body of a Lambda expression can be an expression or a declaration block, while that of an anonymous function can only be a declaration block. · Lambda expressions passed as arguments participant ipate in type argument inference (§ 26. 3.2) and in method overload resolution (§ 26. 3.3 ). · The Lambda