有趣的java-大家一起来猜猜看结果？（如果你有结果请给出你的解释）
案例一:
class Test{ private static Test test = new Test(); public static int counter1; public static int counter2 = 0; public Test() { counter1++; counter2++; } public static Test getInstance() {return test; }}public class ClassLoadTest {public static void main(String[] args){Test test = Test.getInstance();System.out.println("counter1\t"+Test.counter1);System.out.println("counter2\t"+Test.counter2);}}class Test{ public static int counter1; public static int counter2 = 0; private static Test test = new Test(); public Test() { counter1++; counter2++; } public static Test getInstance() {return test; }}public class ClassLoadTest {public static void main(String[] args){Test test = Test.getInstance();System.out.println("counter1\t"+Test.counter1);System.out.println("counter2\t"+Test.counter2);}}abstract class A{public A(){this.print() ;}public abstract void print() ;};class B extends A{private int x = 100 ;public B(int x){this.x = x ;}public void print(){System.out.println("x = " + x) ;}};public class TestJava{public static void main(String args[]){A a = new B(10) ;}};