Java String.equals()算法

时间:2012-12-18 06:05:11

标签: java string algorithm

任何人都知道Java中的String.equals()中使用的算法是什么? Java如何比较两个单词?

2 个答案:

答案 0 :(得分:5)

来自String

的简单函数
    /**
 * Compares this string to the specified object.  The result is {@code
 * true} if and only if the argument is not {@code null} and is a {@code
 * String} object that represents the same sequence of characters as this
 * object.
 *
 * @param  anObject
 *         The object to compare this {@code String} against
 *
 * @return  {@code true} if the given object represents a {@code String}
 *          equivalent to this string, {@code false} otherwise
 *
 * @see  #compareTo(String)
 * @see  #equalsIgnoreCase(String)
 */
public boolean equals(Object anObject) {
    if (this == anObject) {
        return true;
    }
    if (anObject instanceof String) {
        String anotherString = (String) anObject;
        int n = value.length;
        if (n == anotherString.value.length) {
            char v1[] = value;
            char v2[] = anotherString.value;
            int i = 0;
            while (n-- != 0) {
                if (v1[i] != v2[i])
                        return false;
                i++;
            }
            return true;
        }
    }
    return false;
}

答案 1 :(得分:2)

您可以在JDK中看到所有java类的实现。

只需转到JDK_HOME,找到' src.zip ',其中包含所有可以轻松找到String类实现的java类的源代码。