


What is the execution order of Java static blocks, free blocks and constructors
Static block format:
Then start constructing the subclass.
[java] view
plaincopy
package com.lsky.test;
- ##public class Father { ## private int sum;
- //Static block in parent class
- ## static {
## System.out.println("Happy New Year 2010");
}
public void first(int i){
sum= i sum -1 i--;
System.out.println( sum);
}
//Parent class parameterless constructor
public Father (){
System.out.println("Good day");
}
-
//Constructor with parameters
- ## public Father(String s){
- System.out.println("We are students ");
- }
- //Free block in the parent class
- {
- System.out.println("Bodhi has no tree, and the mirror is not a stand. There is nothing in the first place, so how can it cause dust");
- }
- }
- ##package com.lsky.test;
- # public class Son extends Father {
-
private int sum; - private static Father father;
- //Parameter-containing constructor (parameter-containing constructor) in the subclass
- public Son(Father father){
- this();
- father.first(8);
- }
- //No-parameter constructor (no-parameter constructor) in the subclass
- public Son(){
- # this.punk(6);
}- ## public void first(int i){ ## sum=sum i ;
- System.out.println(sum);
- }
- //Static block in subclass
- static{
- ## Father f=new Son();
## f.first(4);
}
- ## int punk(int sum){
- sum=sum;
- return sum;
- }
- //Free block in subclass
- {
- System.out.println("There was a time when the sea was difficult to overcome, except for Wushan, it was not a cloud");
- }
- public static void main(String argsp[]){
Son son=new Son(new Son());
- ## }
- }
[java] view
plaincopy
- ##//The output result is:
-
## Happy New Year 2010 - There is no Bodhi tree, and the mirror is not a stand. There is nothing in the first place, so where can we get the dust?
- A beautiful day
- Once upon a time, the sea was difficult to overcome, except for Wushan, it was not a cloud
- 4
- Bodhi has no tree, and the mirror is not a stand , there is nothing in the first place, where is the dust
- A beautiful day
- Once the sea was filled with water, except for Wushan, it is not a cloud
- There is no Bodhi tree, and the mirror is not a stand. There is nothing in the first place, so where can we cause dust?
- Good day
-
- 8
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