Checks if the String contains only unicode digits. A decimal point is not a unicode digit and returns false. : Unicode « Development « Java Tutorial






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/*
 * 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 {

  /**
   * Checks if the String contains only unicode digits.
   * A decimal point is not a unicode digit and returns false.
   *
   * <code>null</code> will return <code>false</code>.
   * An empty String ("") will return <code>true</code>.
   *
   * <pre>
   * StringUtils.isNumeric(null)   = false
   * StringUtils.isNumeric("")     = true
   * StringUtils.isNumeric("  ")   = false
   * StringUtils.isNumeric("123")  = true
   * StringUtils.isNumeric("12 3") = false
   * StringUtils.isNumeric("ab2c") = false
   * StringUtils.isNumeric("12-3") = false
   * StringUtils.isNumeric("12.3") = false
   * </pre>
   *
   * @param str  the String to check, may be null
   * @return <code>true</code> if only contains digits, and is non-null
   */
  public static boolean isNumeric(String str) {
      if (str == null) {
          return false;
      }
      int sz = str.length();
      for (int i = 0; i < sz; i++) {
          if (Character.isDigit(str.charAt(i)) == false) {
              return false;
          }
      }
      return true;
  }

}








6.16.Unicode
6.16.1.Using Unicode in String
6.16.2.Display special character using Unicode
6.16.3.Convert from Unicode to UTF-8
6.16.4.Convert from UTF-8 to Unicode
6.16.5.Convert string to UTF8 bytes
6.16.6.Converts Unicode into something that can be embedded in a java properties file
6.16.7.Converts the string to the unicode format
6.16.8.Return an UTF-8 encoded String
6.16.9.Return an UTF-8 encoded String by length
6.16.10.Return UTF-8 encoded byte[] representation of a String
6.16.11.Get UTF String Size
6.16.12.Return the number of bytes that hold an Unicode char.
6.16.13.Return the Unicode char which is coded in the bytes at position 0.
6.16.14.Return the Unicode char which is coded in the bytes at the given position.
6.16.15.Checks if the String contains only unicode digits or space
6.16.16.Checks if the String contains only unicode digits. A decimal point is not a unicode digit and returns false.
6.16.17.Checks if the String contains only unicode letters and space (' ').
6.16.18.Checks if the String contains only unicode letters or digits.
6.16.19.Checks if the String contains only unicode letters, digits or space (' ').
6.16.20.Checks if the String contains only unicode letters.
6.16.21.Count the number of bytes included in the given char[].
6.16.22.Count the number of bytes needed to return an Unicode char. This can be from 1 to 6.
6.16.23.Count the number of chars included in the given byte[].
6.16.24.Decodes values of attributes in the DN encoded in hex into a UTF-8 String.
6.16.25.Safe UTF: 64K serialized size