JAVA类的加载顺序

JAVA中类的初始化规则是：先初始化static成员变量和static块，再初始化non-static成员变量和non-static块，最后初始化构造函数。

例1：

package demo;
/**
 * 此类主要介绍java类的加载顺序
 * */

public class TestOrder {
    public static int k = 0;
    public static TestOrder t1 = new TestOrder("t1");
    public static TestOrder t2 = new TestOrder("t2");
    public static int i = print("i");
    public static int n = 99;
    private int a = 0;
    public int j = print("j");
    {
        print("构造块");
    }
    static {
        print("静态块");
    }
    public TestOrder(String str) {
        System.out.println((++k) + ":" + str + "   i=" + i + "    n=" + n);
        ++i;
        ++n;
    }
    public static int print(String str) {
        System.out.println((++k) + ":" + str + "   i=" + i + "    n=" + n);
        ++n;
        return ++i;
    }
    public static void main(String args[]) {
        TestOrder t = new TestOrder("init");
    }
}

其结果为：

1:j i=0 n=0

2:构造块 i=1 n=1

3:t1 i=2 n=2

4:j i=3 n=3

5:构造块 i=4 n=4

6:t2 i=5 n=5

7:i i=6 n=6

8:静态块 i=7 n=99

9:j i=8 n=100

10:构造块 i=9 n=101

11:init i=10 n=102