Java构造代码块及执行优先级

public class StructureCodeBlock {
	// 构造代码块
	{System.out.println("This is StructureCodeBlock");
	}
	public static void main(String[] args){StructureCodeBlock s = new StructureCodeBlock();
	}
}

public class StructureCodeBlock {
	// 成员变量
	public int num = 1000;
	// 构造方法
	public StructureCodeBlock(){this.num = 3000;}
	// 构造代码块
	{this.num = 2000;}
	public static void main(String[] args){StructureCodeBlock s = new StructureCodeBlock();
		System.out.println(s.num);
	}
}