【Java】String字符串反转

    @Test
    public void testStringReverse(){
        String str = "abcdABCD";
        StringBuilder stringBuilder = new StringBuilder(str);
        System.out.println(String.format("反转前：%s", str)); // abcdABCD
        System.out.println(String.format("反转后：%s", stringBuilder.reverse())); // DCBAdcba
    }