Converts a Boolean to a String returning 'true', 'false', or null. - Java java.lang

Java examples for java.lang:boolean

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Description

Converts a Boolean to a String returning 'true', 'false', or null.

Demo Code

/*//from  ww  w.  ja  va2 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.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        boolean bool = true;
        System.out.println(toStringTrueFalse(bool));
    }

    /**
     * <p>Converts a Boolean to a String returning <code>'true'</code>,
     * <code>'false'</code>, or <code>null</code>.</p>
     * 
     * <pre>
     *   BooleanUtils.toStringTrueFalse(Boolean.TRUE)  = "true"
     *   BooleanUtils.toStringTrueFalse(Boolean.FALSE) = "false"
     *   BooleanUtils.toStringTrueFalse(null)          = null;
     * </pre>
     *
     * @param bool  the Boolean to check
     * @return <code>'true'</code>, <code>'false'</code>,
     *  or <code>null</code>
     */
    public static String toStringTrueFalse(Boolean bool) {
        return toString(bool, "true", "false", null);
    }

    /**
     * <p>Converts a boolean to a String returning <code>'true'</code>
     * or <code>'false'</code>.</p>
     * 
     * <pre>
     *   BooleanUtils.toStringTrueFalse(true)   = "true"
     *   BooleanUtils.toStringTrueFalse(false)  = "false"
     * </pre>
     *
     * @param bool  the Boolean to check
     * @return <code>'true'</code>, <code>'false'</code>,
     *  or <code>null</code>
     */
    public static String toStringTrueFalse(boolean bool) {
        return toString(bool, "true", "false");
    }

    /**
     * <p>Converts a Boolean to a String returning one of the input Strings.</p>
     * 
     * <pre>
     *   BooleanUtils.toString(Boolean.TRUE, "true", "false", null)   = "true"
     *   BooleanUtils.toString(Boolean.FALSE, "true", "false", null)  = "false"
     *   BooleanUtils.toString(null, "true", "false", null)           = null;
     * </pre>
     *
     * @param bool  the Boolean to check
     * @param trueString  the String to return if <code>true</code>,
     *  may be <code>null</code>
     * @param falseString  the String to return if <code>false</code>,
     *  may be <code>null</code>
     * @param nullString  the String to return if <code>null</code>,
     *  may be <code>null</code>
     * @return one of the three input Strings
     */
    public static String toString(Boolean bool, String trueString,
            String falseString, String nullString) {
        if (bool == null) {
            return nullString;
        }
        return bool.booleanValue() ? trueString : falseString;
    }

    /**
     * <p>Converts a boolean to a String returning one of the input Strings.</p>
     * 
     * <pre>
     *   BooleanUtils.toString(true, "true", "false")   = "true"
     *   BooleanUtils.toString(false, "true", "false")  = "false"
     * </pre>
     *
     * @param bool  the Boolean to check
     * @param trueString  the String to return if <code>true</code>,
     *  may be <code>null</code>
     * @param falseString  the String to return if <code>false</code>,
     *  may be <code>null</code>
     * @return one of the two input Strings
     */
    public static String toString(boolean bool, String trueString,
            String falseString) {
        return bool ? trueString : falseString;
    }
}

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