从下面四段代码中选择出正确的代码段（） A: public class Something {public static void main(String[] args) {Other o = new Other();new Something().addOne(o);}public void addOne(final Other o) {o.i++;}}class Other {public int i;} B: public class Something {void doSomething () {private String s = ̶”;int l = s.length();}} C: abstract class Name {private String name;public abstract boolean isStupidName(String name) {}} D: public class Something {public int addOne(final int x) {return ++x; }}

从下面四段（A，B，C，D）代码中选择出正确的代码段 A: abstract class Name { private String name; public abstract boolean isStupidName(String name) {} } B: public class Something { void doSomething () { private String s = ""; int l = s.length(); } } C: public class Something { public static void main(String[] args) { Other o = new Other(); new Something().addOne(o); } public void addOne(final Other o) { o.i++; } } class Other { public int i; } D: public class Something { public int addOne(final int x) { return ++x; } }