}
}
public class Hello{
public static void main(String[] ars){
A ab = new B(); //执行到此处,结果是_________
ab = new B(); //执行到此处,结果是_________
}
}
3、事务的 4 个特性是:_________、_________、___________、____________
4.判断以下代码有无错误,如有请指出错误明细:
abstract class Something {
private abstract String doSomething ();
}
5. 判断以下代码有无错误,如有请指出错误明细:
public class Something {
public int addOne(final int x) {
return ++x;
}
}
6. 判断以下代码有无错误,如有请指出错误明细
public class Something {
public static void main(String[] args) {
Something s = new Something();
System.out.println("s.doSomething() returns " + doSomething());
}
public String doSomething() {
return "Do something ...";
}
}
7. 判断以下代码有无错误,如有请指出错误明细
interface Playable {
void play();
}
interface Bounceable {
void play();
2