下列定义字符串类string对象的语句中，错误的是（）。

A.vector <int> x;

B.vector <double> x;

C.vector <string> x;

D.vector x;

A.String s[ ] [ ] = new String [ ] [ ] { { “One “ , “ Two “ }, { “ Three “ , “ Four “ } } ;

B.String s[ ] [ ] = { { “ One “ , “Two “},{ “ Three “ , “ Four “ } } ;

C.String s[ ] [ ] = new String [ ] [ ] { { “Zero”} , { “ One ” , “Two” , “ Three” , “ Four” } } ;

D.String s[ 2] [2 ] = { { “ One ” , “Two”},{“ Three” , “ Four” } } ;

A.Exception e = new Exception(); throw e;

B.throw new Exception();

C.throw new IOException ();

D.throw new String();

A.String类可以有子类

B.StringBuffer类能够创建可修改的字符串序列

C.String对象有insert() 和append() 方法向字符串中间和末尾添加字符

D.StringTokenizer类能够分解字符串，它使用正则表达式做分割标记

A.int a[]={6,7,8};

B.int n=5,a[n];

C.char a[]="string";

D.char a[5]={ '0','1' ,'2' ,'3' ,'4'};

A.String

B.StringBuilder

C.StringBuffer

D.Character

A.字符串(String)

B.对象(Object)

C.数组(Array)

D.字典(Dict)