怎么判断一个由字符数组转换成的字符串是否存在于字符串数组中？？

[mrany_cxm]

怎么判断一个由字符数组转换成的字符串是否存在于字符串数组中？？这只是我写的一个例子，明明字符数组转换成的字符串存在于字符串数组中，但我用的这两种方法都判断不出来。感觉是跟字符串常量和字符串对象有关，但是不知道要怎么改代码才能判断出来，求解！！（emmmm。。用字符数组是因为我要实现的功能要用到）

String[] reservedWords ={ "auto", "break", "case", "char", "const", "continue", "default",
			"do", "double", "else", "enum", "extern", "float", "for", "goto", "if", "int", "long", "register", "return",
			"short", "signed", "sizeof", "static", "struct", "switch", "typedef", "union", "unsigned", "void",
			"volatile", "while" };
char[] word=new char[20];
word[0]='s';
word[1]='h';
word[2]='o';
word[3]='r';
word[4]='t';
String str=new String(word);
System.out.println("str"); //输出short

int i=Arrays.binarySearch(reservedWords, str2);
System.out.println(i);    //输出-22

for(String a:reservedWords) {
      if(str.equals(a)) {
              System.out.println("YES"); //不输出YES
      }
}