generate Random String by case - Java java.lang

Java examples for java.lang:String Random

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Description

generate Random String by case

Demo Code

/*/*from  w  w  w . j a  va2  s.co  m*/
 * Copyright 2013, The Sporting Exchange Limited
 *
 * 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.
 */
//package com.java2s;

import java.util.Random;

public class Main {
    public static void main(String[] argv) {
        int Length = 42;
        String caseType = "java2s.com";
        System.out.println(generateRandomString(Length, caseType));
    }

    public static String generateRandomString(int Length, String caseType) {

        String[] caseList = new String[Length];
        if (caseType.toUpperCase().matches("UPPER")) {
            for (int i = 0; i < caseList.length; i++) {
                caseList[i] = "UPPER";
            }
        } else if (caseType.toUpperCase().matches("LOWER")) {
            for (int i = 0; i < caseList.length; i++) {
                caseList[i] = "LOWER";
            }
        } else if (caseType.toUpperCase().matches("FIRSTUPPER")) {
            for (int i = 0; i < caseList.length; i++) {
                if (i == 0) {
                    caseList[i] = "UPPER";
                } else {
                    caseList[i] = "LOWER";
                }
            }
        } else if (caseType.toUpperCase().matches("MIXED")) {
            for (int i = 0; i < caseList.length; i++) {
                Random RND = new Random();
                boolean yBool = RND.nextBoolean();
                if (yBool) {
                    caseList[i] = "UPPER";
                } else {
                    caseList[i] = "LOWER";
                }
            }
        } else {
            for (int i = 0; i < caseList.length; i++) {
                Random RND = new Random();
                boolean yBool = RND.nextBoolean();
                if (yBool) {
                    caseList[i] = "UPPER";
                } else {
                    caseList[i] = "LOWER";
                }
            }
        }

        String returnString = "";
        int tempInt;
        char randomChar;
        for (int i = 0; i < caseList.length; i++) {
            if (caseList[i].matches("UPPER")) {
                Random RNG1 = new Random();
                tempInt = RNG1.nextInt(90 - 65 + 1) + 65;
                randomChar = (char) tempInt;
            } else {
                Random RNG2 = new Random();
                tempInt = (char) RNG2.nextInt(122 - 97 + 1) + 97;
                randomChar = (char) tempInt;
            }
            returnString = returnString + String.valueOf(randomChar);
        }

        return returnString;

    }
}

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