space.lingu.light.util.StringUtil Maven / Gradle / Ivy
/*
* Copyright (C) 2022 Lingu Light Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package space.lingu.light.util;
import java.util.Locale;
public class StringUtil {
public static boolean isEmpty(String s) {
if (s == null) {
return true;
}
return s.isEmpty();
}
public static String firstUpperCase(String s) {
if (isEmpty(s)) {
return "";
}
if (Character.isUpperCase(s.charAt(0))) {
return s;
}
if (s.length() == 1) {
return s.toUpperCase(Locale.US);
}
return s.substring(0, 1).toUpperCase(Locale.US) + s.substring(1);
}
public static String firstLowerCase(String s) {
if (isEmpty(s)) {
return "";
}
if (Character.isLowerCase(s.charAt(0))) {
return s;
}
if (s.length() == 1) {
return s.toLowerCase(Locale.US);
}
return s.substring(0, 1).toLowerCase(Locale.US) + s.substring(1);
}
}