The block object oriented code java-

1. The code block appreciated

Enclosed by {} code;

2. The classification block

. A local block - means for defining a variable life cycle, early release, improved memory utilization. With the execution of the method is performed;
B block structure - a plurality constructor same code can be placed here, a constructor before each execution block configured to execute first;.
. C static block of code - action It can be performed once the initial exchange data classes, the class loading time;

3. execution order

Static block of code> configuration block> partial block

4. execution order demo

class Student{
    //静态代码块
    static{
        System.out.println("我是student的静态代码块");
    }

    //构造代码块
    {
        System.out.println("student的构造代码块");
    }
    public Student(){
        System.out.println("student的无参构造");
    }
    public Student(int a){
        System.out.println("student的有参构造");
    }
    
    public void show(){
        {
            System.out.println("student的局部代码块");
        }
    }
}
class Test{
    public static void main(String[] args){
        
        Student student1 = new Student();
        
        Student student2 = new Student(1);
        student2.show();
    }
}

The results:
I am a student of the static code block
construction block student's
constructor without parameters student of
student construction block
student has constructed a reference
partial block of student