Java String.equals() algorithm

Question

>有人知道Java中String.equals()使用的算法是什么吗？Java如何比较这两个词？

Answer 1

字符串

中的简单函数

    /**
 * 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;
}

Answer 2

您可以在 JDK 中看到 java 类的所有实现。

只需转到您的JDK_HOME，在那里您可以找到"src.zip"，其中包含所有 java 类的源代码，您可以在其中轻松找到 String 类的实现。