1, normal code block 2, building block 3, static code block

1, Common code block

 Package com.java1234.chap03.sec07;  Public class Demo1 {    publicstaticvoid  main (string[] args) {        int a=1;                 /** Normal code block (sequential execution)         *          */        {            a=2;            System.out.println ("Normal code block");        }         System.out.println ("a=" +a);}    }

2, construction block

Package com.java1234.chap03.sec07;

public class Demo2 {
/**
* Building Blocks (bridging the gaps in constructors)
*/
{
SYSTEM.OUT.PRINTLN ("General construction Method");
}

Public Demo2 () {
System.out.println ("Construction Method One");
}
Public Demo2 (int i) {
System.out.println ("Construction Method II");
}
Public Demo2 (int i,int j) {
System.out.println ("Construction Method three");
}
public static void Main (string[] args) {
New Demo2 ();//instantiation of an Object anonymous class
}

}

3, Static code block

Package com.java1234.chap03.sec07;

public class Demo3 {
/** Building Blocks
*
*/
{
SYSTEM.OUT.PRINTLN ("Common building Block");
}
/* Static code block (only once, factory executes only once)
* */
static{
System.out.println ("Static code block");
}

Public Demo3 () {
System.out.println ("Construction Method One");
}
Public Demo3 (int i) {
System.out.println ("Construction Method II");
}
Public Demo3 (int i,int j) {
System.out.println ("Construction Method three");
}
public static void Main (string[] args) {
New Demo3 ();//instantiation of an Object anonymous class
New Demo3 (2);
New Demo3 (1, 2);
}

}

1, normal code block 2, building block 3, static code block