java类的初始化

Java代码
public class Test1
{
public static void main(String[] args)
{
Test2 t2 = new Test2();
System.out.println();
Test3 t3 = new Test3();
}
}

class Test2
{
static
{
System.out.println("Test2 static");
}

public Test2()
{
System.out.println("Test2 create");
}
}

class Test3 extends Test2
{
static
{
System.out.println("Test3 static");
}

public Test3()
{
System.out.println("Test3 create");
}
}

public class Test1
{
public static void main(String[] args)
{
Test2 t2 = new Test2();
System.out.println();
Test3 t3 = new Test3();
}
}

class Test2
{
static
{
System.out.println("Test2 static");
}

public Test2()
{
System.out.println("Test2 create");
}
}

class Test3 extends Test2
{
static
{
System.out.println("Test3 static");
}

public Test3()
{
System.out.println("Test3 create");
}
}

输出为：



Java代码
Test2 static
Test2 create

Test3 static
Test2 create
Test3 create

Test2 static
Test2 create

Test3 static
Test2 create
Test3 create




如果把Test2 t2 = new Test2();注释掉，这时输出为：

Java代码
Test2 static
Test3 static
Test2 create
Test3 create