Java Object-oriented _ enhanced for variable parameters and code blocks

1.foreach Cycle

For (type variable name: Array or collection) {

Output operation

}

2. Variable parameters: Automatically pass in any number of parameters as required, that is, variable parameters.

Syntax: return value type method name (data type ... Parameter name) {

}

Cases:

1UblicclassPractice14 {2 3     /**4      * @paramargs5      */6      Public Static voidMain (string[] args) {7         //TODO auto-generated Method Stub8         /*string[] name={"Xiao Ming", "Wax Gourd", "Xiao Gang", "Shian"};9 For (String n:name) {Ten System.out.println (n); One         }*/ APrint ("Xiao Ming", "Wax Gourd", "Xiao Gang", "Shian"); -  - } the     //variable parameters (as arrays when used), variable parameters can only have one -      Public Static voidPrint (string...params) { -         //foreach Loop -          for(String s:params) { + System.out.println (s); -         } +     } A}

3. Code block

Common code blocks: code blocks that are written directly in the method

Construct a code block: a block of code defined in a class. Constructs a block of code that executes first, in other words, when a new object is

Static code block: a block of code that uses static declarations in a class

Cases:

1  Public classPractice14 {2     Static{3SYSTEM.OUT.PRINTLN ("Static Fast");4     }5     {6SYSTEM.OUT.PRINTLN ("Fast construction"); 7     }8         9      Public Static voidMain (string[] args) {Ten         //TODO auto-generated Method Stub OnePractice14 test1=NewPractice14 (); APractice14 test2=NewPractice14 (); -  - } the      -}

This example outputs a static fast, two-time construction block

Java Object-oriented _ enhanced for variable parameters and code blocks