多选题

下列程序有错误的是？（&nbsp ）

Question

下列程序有错误的是？（  ）

A. abstract class Something {
private abstract String doSomething ()
}

B. public class Something {
void doSomething () {
private String s = ""
int l = s.length()
}
}

C. abstract class Name {
private String name
public abstract boolean isSomething(String name){}
}

D. public class Something {
public static void main(String[] args) {
Thing t = new Thing()
new Something().addOne(t)
}
public void addOne(final Thing t) {
t.i++
}
}
class Thing {
public int i
}