字符串中大小写转换小例
package week11_2;
/**
* 转换大小写
* @author Guozhu Zhu
* @date 2019/5/7
* @version 1.0
*
*/
public class Demo01 {
/* ========== Test ========== */
public static void main(String[] args) {
String str = "abcDE";
String res01 = toLowwerCase(str);
String res02 = toUpperCase(str);
System.out.println(res01);
System.out.println(res02);
}
//转化成小写
public static String toLowwerCase(String str) {
char[] ch = str.toCharArray();
for (int i = 0; i < str.length(); i++) {
if (ch[i] >= 'A' && ch[i] <= 'Z') {
ch[i] = (char)(ch[i]+'a'-'A');
}
}
return new String(ch);
}
//转化成大写
public static String toUpperCase(String str) {
char[] ch = str.toCharArray();
for (int i = 0; i < str.length(); i++) {
if (ch[i] >= 'a' && ch[i] <= 'z') {
ch[i] = (char)(ch[i]+'A'-'a');
}
}
return new String(ch);
}
}