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分析程序看有没有问题，如果有，说出原因即可。1.abstract class Name {   private String name;   public abstract boolean isStupidName(String name) {}}     2.public class Something {   void doSomething () {       private String s = "";       int l = s.length();   }} 3.abstract class Something {   private abstract String doSomething ();}    4.public class Something {   public int addOne(final int x) {       return ++x;   }}    5.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;}    6.class Something {    int i;    public void doSomething() {        System.out.println("i = " + i);    }} 7.class Something {    final int i;    public void doSomething() {        System.out.println("i = " + i);    }}    8.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 ...";    }}    9.此处，Something类的文件名叫OtherThing.javaclass Something {    private static void main(String[] something_to_do) {                System.out.println("Do something ...");    }} 10．interface  A{   int x = 0;}class B{   int x =1;}class C extends B implements A {   public void pX(){      System.out.println(x);   }   public static void main(String[] args) {      new C().pX();   }}     11.interface Playable {    void play();}interface Bounceable {    void play();}interface Rollable extends Playable, Bounceable {    Ball ball = new Ball("PingPang");}class Ball implements Rollable {    private String name;    public String getName() {        return name;    }    public Ball(String name) {        this.name = name;            }   public void play() {        ball = new Ball("Football");        System.out.println(ball.getName());    }}

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