Here you can find the source of countChars( final String testString, final char match )
public static long countChars( final String testString, final char match )
//package com.java2s; /*// w ww . ja v a 2 s .co m This file is licensed to You 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. */ public class Main { public static long countChars( final String testString, final char match ) { return testString.codePoints().filter( ch -> ch == match ).count(); } }