instanceof 增强

    @Test
    public void jinTest() {
        Object obj = "jin";

        if (obj instanceof String) {
            String str = (String) obj;
            System.out.println("str:" + str);
        }

        if (obj instanceof String newStr) {
            System.out.println("newStr:" + newStr);
        }
    }

结果输出

str:jin
newStr:jin