demo1Student stu = null;// unKnownString stuName = Optional.ofNullable(stu).map(Student::getName).orElse("unKnown");demo2stu
原创
2022-02-18 09:50:39
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demo1Student stu = null;// unKnownString stuName = Optional.ofNullable(stu).map(Student::getName).orElse("unKnown");demo2stu = new Student();stu.setName("king");// kingstuName = Optional.ofNullable(stu).map(Student::getName).orElse("unKnown"
原创
2021-08-25 10:57:03
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