Java-4.7 constructor initialization (3)

Java-4.7 constructor initialization (3)

Next, go to the previous chapter.

(4) initialize static explicit Fields

Some attribute fields are initialized using static code blocks.

package com.ray.testobject;public class Test {private static int id;private static String name;static {id = 0;name = abc;System.out.println(id: + id);System.out.println(name: + name);}public static int getId() {return id;}public static void main(String[] args) {// new Test();System.out.println(Test.getId());}}

 

If we release new Test (), the following results will be obtained. Because the code block is executed only once.

Output:

Id: 0
Name: abc
0

 

Here is an example:

package com.ray.testobject;public class Test {private static int id = 0;private static String name;static {System.out.println(id: + id);name = abc;System.out.println(name: + name);}public Test() {System.out.println(create Test);}public static void main(String[] args) {new Test();new Test();}}

Output:

Id: 0
Name: abc
Create Test
Create Test

 

(5) initialize non-static Domains

package com.ray.testobject;public class Test {private String name;{name = abc;System.out.println(name: + name);}public static void main(String[] args) {new Test();new Test();}}

Output:

Name: abc
Name: abc

Initialize non-static fields. Each new code block is executed once.

 

Summary: This chapter mainly discusses explicit static domain initialization and non-static domain initialization.

 

This chapter is here. Thank you.

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