Java tutorial
//package com.java2s; /** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file 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 final int UNI_SUR_HIGH_START = 0xD800; public static final int UNI_SUR_HIGH_END = 0xDBFF; public static final int UNI_SUR_LOW_START = 0xDC00; public static final int UNI_SUR_LOW_END = 0xDFFF; public static boolean validUTF16String(CharSequence s) { final int size = s.length(); for (int i = 0; i < size; i++) { char ch = s.charAt(i); if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) { if (i < size - 1) { i++; char nextCH = s.charAt(i); if (nextCH >= UNI_SUR_LOW_START && nextCH <= UNI_SUR_LOW_END) { // Valid surrogate pair } else // Unmatched high surrogate return false; } else // Unmatched high surrogate return false; } else if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) // Unmatched low surrogate return false; } return true; } }