Java code block, common code block, construction code block, static code block

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Just learned the Java code block, although very simple or write it down!

left Sound 2016-03-16

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Execution priority: Static code block > Mian Method > Construct code block > Construction Method

Static code blocks are executed once, regardless of whether they are instantiated, and do not repeat

Executes when constructing a code block instantiation

1, ordinary code block

Ordinary block of code in a method or statement

1PublicClassCodeblock {23PublicStaticvoidMain (string[] args) {45int I; 6  { 7 i = 5; 8 } 9 System.out.println ("i=" +i); 10 }11 }12 13 /*14  run Result: 15 i=516 17 */           

2. Building code Blocks

Constructs a block of code that is defined directly in the class without the Add static keyword

1PublicClassCodeblock {23{4 System.out.println ("Construct code block");5}67Codeblock () {8 System.out.println ("Construction Method"));9}1011 public static void Main (string[] args) {12 codeblock C = new Codeblock (); }14 }15 /*16  running result: 17  construction code block 18  construction method 19 20 */       

3. Static code block

//Construct code blocks defined directly in the class and with the static keyword

1  Public classCodeblock {2     3     {4System.out.println ("Construct code block");5     }6     7     Static{8System.out.println ("Static code block");9     }Ten      One Codeblock () { ASystem.out.println ("Construction Method One")); -     } -      theCodeblock (ints) { -System.out.println ("Construction Method II")); -     } -      +      Public Static voidMain (string[] args) { -         NewCodeblock (); +         NewCodeblock (10); A     } at } -  - /* - Operation Result: - Static code block - Building Code Blocks in Construction Method One - Building Code Blocks to Construction Method Two +  - */

Java code block, common code block, construction code block, static code block