index Of string and handle null value - Android java.lang

Description

index Of string and handle null value

Demo Code

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.security.SecureRandom;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Locale;

public class Main{

    /**//w  w w  . j a  va 2s  . c  o  m

     * 
     * <pre>
     * StringUtil.indexOf(null, *)          = -1
     * StringUtil.indexOf(*, null)          = -1
     * StringUtil.indexOf("", "")           = 0
     * StringUtil.indexOf("aabaabaa", "a")  = 0
     * StringUtil.indexOf("aabaabaa", "b")  = 2
     * StringUtil.indexOf("aabaabaa", "ab") = 1
     * StringUtil.indexOf("aabaabaa", "")   = 0
     * </pre>
     */
    public static int indexOf(String str, String searchStr) {
        if (str == null || searchStr == null) {
            return -1;
        }
        return str.indexOf(searchStr);
    }

}

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