Java Double Number Create toDouble(String str, double defaultValue)

Description

Convert a String to a double, returning a default value if the conversion fails.

License

Apache License

Parameter

Parameter	Description
str	the string to convert, may be <code>null</code>
defaultValue	the default value

Return

the double represented by the string, or defaultValue if conversion fails

Declaration

public static double toDouble(String str, double defaultValue) 

Method Source Code

//package com.java2s;
/*// w ww  . jav a 2 s.c  om
 * 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 {
    /**
     * <p>
     * Convert a <code>String</code> to a <code>double</code>, returning <code>0.0d</code> if the conversion fails.
     * </p>
     * 
     * <p>
     * If the string <code>str</code> is <code>null</code>, <code>0.0d</code> is returned.
     * </p>
     * 
     * <pre>
     *   NumberUtils.toDouble(null)   = 0.0d
     *   NumberUtils.toDouble("")     = 0.0d
     *   NumberUtils.toDouble("1.5")  = 1.5d
     * </pre>
     * 
     * @param str
     *            the string to convert, may be <code>null</code>
     * @return the double represented by the string, or <code>0.0d</code> if conversion fails
     * @since 2.1
     */
    public static double toDouble(String str) {
        return toDouble(str, 0.0d);
    }

    /**
     * <p>
     * Convert a <code>String</code> to a <code>double</code>, returning a default value if the conversion fails.
     * </p>
     * 
     * <p>
     * If the string <code>str</code> is <code>null</code>, the default value is returned.
     * </p>
     * 
     * <pre>
     *   NumberUtils.toDouble(null, 1.1d)   = 1.1d
     *   NumberUtils.toDouble("", 1.1d)     = 1.1d
     *   NumberUtils.toDouble("1.5", 0.0d)  = 1.5d
     * </pre>
     * 
     * @param str
     *            the string to convert, may be <code>null</code>
     * @param defaultValue
     *            the default value
     * @return the double represented by the string, or defaultValue if conversion fails
     * @since 2.1
     */
    public static double toDouble(String str, double defaultValue) {
        if (str == null) {
            return defaultValue;
        }
        try {
            return Double.parseDouble(str);
        } catch (NumberFormatException nfe) {
            return defaultValue;
        }
    }
}

Related

1. toDouble(String str)
2. toDouble(String str)
3. toDouble(String str)
4. toDouble(String str)
5. toDouble(String str)
6. toDouble(String string)
7. ToDouble(String string)
8. toDouble(String v, double def)
9. toDouble(String val)