// 数字转换为字符串
int a = 332;
String str = String.valueOf(a);
//字符串转换为数字
String str = "abcd";
int a = Integer.parseInt(str);
//字符串转化为字符数组
String str = " acbd";
char[] c = str.toCharArray();
//字符数组转化为字符串
char[] c = {'a','b','c'};
String str = String.valueOf(c);