Here you can find the source of toCodePoint(char highSurrogate, char lowSurrogate)
public static int toCodePoint(char highSurrogate, char lowSurrogate)
//package com.java2s; /*//from www .j a va 2 s .c o m * Copyright 2008 Google Inc. * * 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. */ public class Main { public static final int MIN_SUPPLEMENTARY_CODE_POINT = 0x10000; public static int toCodePoint(char highSurrogate, char lowSurrogate) { /* * High and low surrogate chars have the bottom 10 bits to store the * value above MIN_SUPPLEMENTARY_CODE_POINT, so grab those bits and add * the offset. */ return MIN_SUPPLEMENTARY_CODE_POINT + ((highSurrogate & 1023) << 10) + (lowSurrogate & 1023); } }