package com.coderising.litestruts.util;
/**
* Created by luoziyihao on 3/5/17.
*/
public class StringUtils {
/**
* 改变指定位置的 char的大小写
*/
public String toUpperCase(String str, int index) {
char[] chars = str.toCharArray();
if (index + 1 > chars.length) {
throw new RuntimeException("the char at the index don't exist");
}
chars[index] = Character.toUpperCase(chars[index]);
return new String(chars);
}
/**
* 改变指定位置的 char的大小写
*/
public String toLowwerCase(String str, int index) {
char[] chars = str.toCharArray();
if (index + 1 > chars.length ) {throw new RuntimeException("the char at the index don't exist");}
chars[index] = Character.toLowerCase(chars[index]);
return new String(chars);
}
public boolean isSpaceOrNull(String paraName) {
return (paraName == null || paraName.trim().isEmpty());
}
}