class?A?{
????static?{
????????System.out.print("1");
????}????public?A()?{
????????System.out.print("2");
????}
}class?B?extends?A{
????static?{
????????System.out.print("a");
????}????public?B()?{
????????System.out.print("b");
????}
}public?class?Hello?{
????public?static?void?main(String[]?args)?{
????????A?ab?=?new?B();
????????ab?=?new?B();
????}
}為什么是1a2b2b，能說一說原理嗎？
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