Java yyyy format(Object value, String pattern)

Description

format

License

Apache License

Declaration

public static String format(Object value, String pattern) 

Method Source Code

//package com.java2s;
/*******************************************************************************
* Copyright 2007-2013 See AUTHORS file./*w  ww. ja  va2  s . co  m*/
 * 
* 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.
******************************************************************************/

import java.text.DecimalFormat;
import java.text.FieldPosition;

import java.text.SimpleDateFormat;

import java.util.Date;

public class Main {
    public static final String VALUE_BLANK = "";

    public static String format(Object value, String pattern) {
        if (value == null)
            return VALUE_BLANK;

        if (value instanceof Number) {
            DecimalFormat df = null;
            if (pattern == null || VALUE_BLANK.equals(pattern)) {
                df = new DecimalFormat("#.####################");
            } else {
                df = new DecimalFormat(pattern);
            }

            return df.format(value, new StringBuffer(), new FieldPosition(0)).toString();
        } else if (value instanceof Date) {
            SimpleDateFormat sf = null;
            if (pattern == null || VALUE_BLANK.equals(pattern)) {
                sf = new SimpleDateFormat("yyyy-MM-dd");
            } else {
                sf = new SimpleDateFormat(pattern);
            }

            return sf.format(value);
        } else {
            return value.toString();
        }
    }
}

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