Returns true if a and b are equal ignoring the case of the character - Android java.lang

Android examples for java.lang:String Equals

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Description

Returns true if a and b are equal ignoring the case of the character

Demo Code

import android.text.TextUtils;
import java.util.ArrayList;
import java.util.Locale;

public class Main{

    /**/*from   ww  w.jav  a2  s  .c o m*/
     * Returns true if a and b are equal ignoring the case of the character.
     * @param a first character to check
     * @param b second character to check
     * @return {@code true} if a and b are equal, {@code false} otherwise.
     */
    public static boolean equalsIgnoreCase(char a, char b) {
        // Some language, such as Turkish, need testing both cases.
        return a == b
                || Character.toLowerCase(a) == Character.toLowerCase(b)
                || Character.toUpperCase(a) == Character.toUpperCase(b);
    }
    /**
     * Returns true if a and b are equal ignoring the case of the characters, including if they are
     * both null.
     * @param a first CharSequence to check
     * @param b second CharSequence to check
     * @return {@code true} if a and b are equal, {@code false} otherwise.
     */
    public static boolean equalsIgnoreCase(CharSequence a, CharSequence b) {
        if (a == b)
            return true; // including both a and b are null.
        if (a == null || b == null)
            return false;
        final int length = a.length();
        if (length != b.length())
            return false;
        for (int i = 0; i < length; i++) {
            if (!equalsIgnoreCase(a.charAt(i), b.charAt(i)))
                return false;
        }
        return true;
    }
    /**
     * Returns true if a and b are equal ignoring the case of the characters, including if a is null
     * and b is zero length.
     * @param a CharSequence to check
     * @param b character array to check
     * @param offset start offset of array b
     * @param length length of characters in array b
     * @return {@code true} if a and b are equal, {@code false} otherwise.
     * @throws IndexOutOfBoundsException
     *   if {@code offset < 0 || length < 0 || offset + length > data.length}.
     * @throws NullPointerException if {@code b == null}.
     */
    public static boolean equalsIgnoreCase(CharSequence a, char[] b,
            int offset, int length) {
        if (offset < 0 || length < 0 || length > b.length - offset)
            throw new IndexOutOfBoundsException("array.length=" + b.length
                    + " offset=" + offset + " length=" + length);
        if (a == null)
            return length == 0; // including a is null and b is zero length.
        if (a.length() != length)
            return false;
        for (int i = 0; i < length; i++) {
            if (!equalsIgnoreCase(a.charAt(i), b[offset + i]))
                return false;
        }
        return true;
    }

}

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