实用类型转换

int转char

int i=9;
char ch=(char)(i+'0');

int转String

int i=10;
String str=String.valueOf(i);

String转int

String s=new String();
int x=Integer.parseInt(s);

StringBuffer转String

StringBuffer sb=new StringBuffer();
String str=new String(sb);// 或 String str=sb.toString();