成员变量在构造器之后

public class Super {

public Super(){printThree();}   //===2
public void printThree() {
System.out.println("three");
}
}

public class Test extends Super {

int three = (int)Math.PI;
public void printThree() {
System.out.println(three);//===3 three=0，成员变量在构造器之后

}

public static void main(String[] args) {
Test t = new Test();        //===1
t.printThree();             //===4
}

}