Here you can find the source of codePointAt(String _this, int index)
| Parameter | Description |
|---|---|
| index | the index to the char values |
static int codePointAt(String _this, int index)
//package com.java2s; /*/* w ww. j av a2s . c om*/ * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ public class Main { /** * Returns the character (Unicode code point) at the specified * index. The index refers to {@code char} values * (Unicode code units) and ranges from {@code 0} to * {@link #length()}{@code - 1}. * * <p> If the {@code char} value specified at the given index * is in the high-surrogate range, the following index is less * than the length of this {@code String}, and the * {@code char} value at the following index is in the * low-surrogate range, then the supplementary code point * corresponding to this surrogate pair is returned. Otherwise, * the {@code char} value at the given index is returned. * * @param index the index to the {@code char} values * @return the code point value of the character at the * {@code index} * @exception IndexOutOfBoundsException if the {@code index} * argument is negative or not less than the length of this * string. * @since 1.5 */ static int codePointAt(String _this, int index) { if ((index < 0) || (index >= _this.length())) { throw new StringIndexOutOfBoundsException(index); } char c1 = _this.charAt(index++); if (Character.isHighSurrogate(c1)) { if (index < _this.length()) { char c2 = _this.charAt(index); if (Character.isLowSurrogate(c2)) { return Character.toCodePoint(c1, c2); } } } return c1; } }