java 代码块顺序

java 代码块的执行顺序:

静态变量 > 非静态变量
静态变量 > 静态代码块 > 非静态代码块
父构造 > 子构造
父静态变量 > 父静态代码块 >子静态变量 > 子静态代码块 > 父非静态代码块 > 父构造 > 子非静态代码块 > 子构造.
静态代码块仅仅执行一次， 非静态代码块可以执行多次。

public class TestCodeBlockFather {

    {
        System.out.println("TestCodeBlockFather code block construct...");
    }

    static {
        System.out.println(" static TestCodeBlockFather code block construct...");
    }

    public TestCodeBlockFather() {
        System.out.println("father construct...");
    }
}

public class TestCodeBlock extends TestCodeBlockFather {
    {
        System.out.println("before construct...." + staticStr);
    }

    private static String staticStr = "TestCodeBlock-static var";
    private String str = "TestCodeBlock var";

    static {
        System.out.println("static before construct....2");
    }
    static {
        System.out.println("static before construct....3");
    }

    public TestCodeBlock() {
        System.out.println("construct.." + str);
    }

    {
        System.out.println("after construct ...");
    }

    public String getTime() {
        try{
            return LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        } finally {
            return "lastReturn";
        }
    }
    public static void main(String[] args) {
        TestCodeBlock testCodeBlock = new TestCodeBlock();
        System.out.println(testCodeBlock.getTime());
        new TestCodeBlock();
    }
}

结果

 static TestCodeBlockFather code block construct...
static before construct....2
static before construct....3
TestCodeBlockFather code block construct...
father construct...
before construct....TestCodeBlock-static var
after construct ...
construct..TestCodeBlock var
lastReturn
TestCodeBlockFather code block construct...
father construct...
before construct....TestCodeBlock-static var
after construct ...
construct..TestCodeBlock var