Is CONSTANT.equals(VARIABLE) faster than VARIABLE.equals(CONSTANT)?

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小蘑菇
小蘑菇 2021-02-07 11:43

I had an interesting conversation with one of my team mate.

Is CONSTANT.equals(VARIABLE) faster than VARIABLE.equals(CONSTANT)in Java?

7条回答
  •  逝去的感伤
    2021-02-07 12:10

    I guess the code in java.lang.String supports my answer:

    public boolean equals(Object anObject) {
        if (this == anObject) {
            return true;
        }
        if (anObject instanceof String) {
            String anotherString = (String)anObject;
            int n = count;
            if (n == anotherString.count) {
                char v1[] = value;
                char v2[] = anotherString.value;
                int i = offset;
                int j = anotherString.offset;
                while (n-- != 0) {
                    if (v1[i++] != v2[j++])
                        return false;
                }
                return true;
            }
        }
        return false;
    }
    

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