Here you can find the source of getRandomChar(int x)
| Parameter | Description |
|---|---|
| x | 0: 0~9; 1: A~Z; 2: a~z; other: word |
public static char getRandomChar(int x)
//package com.java2s; /*/*from w w w.ja v a2 s.c o m*/ * 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. */ import java.util.Random; public class Main { /** * Gets random char. * * @param x 0: 0~9; 1: A~Z; 2: a~z; other: word * @return {char} */ public static char getRandomChar(int x) { Random r = new Random(); char c = '0'; // 48-57 65-90 97-122 u4e00~9fa5 u9fff switch (x) { case 0: c = (char) (r.nextInt(10) + 48); //0 ~ 9 break; case 1: c = (char) (r.nextInt(26) + 97); //A ~ Z break; case 2: c = (char) (r.nextInt(26) + 65); //a ~ z break; default: String s = Integer .toHexString((r.nextInt(0x9fa5 - 0x4e00) + 0x4e00)); c = (char) Integer.parseInt(s, 16); break; } return c; } }