StringUtils之equals
打开org.apache.commons.lang包下面的StringUtils.class源码
/** * <p>Compares two Strings, returning <code>true</code> if they are equal.</p> * * <p><code>null</code>s are handled without exceptions. Two <code>null</code> * references are considered to be equal. The comparison is case sensitive.</p> * * <pre> * StringUtils.equals(null, null) = true * StringUtils.equals(null, "abc") = false * StringUtils.equals("abc", null) = false * StringUtils.equals("abc", "abc") = true * StringUtils.equals("abc", "ABC") = false * </pre> * * @see java.lang.String#equals(Object) * @param str1 the first String, may be null * @param str2 the second String, may be null * @return <code>true</code> if the Strings are equal, case sensitive, or * both <code>null</code> */ public static boolean equals(String str1, String str2) { return str1 == null ? str2 == null : str1.equals(str2);