Java類的初始化順序如下：

1.靜態(tài)常量、變量和塊首先按照它們在代碼中出現(xiàn)的順序進(jìn)行初始化;

2.然后非靜態(tài)常量、變量和塊首先按照它們在代碼中出現(xiàn)的順序進(jìn)行初始化;考慮以下代碼：

public class Sample{
 static Sample2 a = new Sample2();
 Sample2 b = new Sample2("Instance variable"); 
 public Sample(){
 System.out.println("Constructor");
 } 
 static{
 System.out.println("Static block");
 } 
 public static void main(String[] args) {
 new Sample();
 }
}
class Sample2{ 
 public Sample2(){
 System.out.println("Sample2 Constructor");
 } 
 public Sample2(String str){
 System.out.println(str);
 }
}

根據(jù)上述第 1 點(diǎn)和第 2 點(diǎn)，顯示的結(jié)果將是：

Sample2 Constructor
Static block
Instance variable
Constructor