如何将字符串反转？

使用 StringBuilder 或者 stringBuffer 的 reverse() 方法。

代码示例：

public class TestOne {
    public static void main(String[] args) {
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append("abcdefg");
        // stringBuffer.reverse()
        StringBuffer reverse = stringBuffer.reverse();
        System.out.println(reverse); // gfedcba

        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("abcdefg");
        // stringBuilder.reverse()
        StringBuilder builder = stringBuilder.reverse(); // gfedcba
        System.out.println(builder);
    }
}

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