英文:
How to check the variables of an Object are Empty or NULL in JAVA?
问题
如何在JAVA中检查“对象的变量”是否为空或NULL？
Employee employee = repository.getEmployee(id).orElseGet(null);
if (employee == null) {
employee = new Employee();
employee.id(1);
employee.name("Thirumal");
employee.mobile("+91-8973-697-871");
repository.save(employee);
}
而不是使用“NULL”，我正在尝试创建一个新的Employee对象
Employee employee = repository.getEmployee(id).orElseGet(new Employee());
if (employee.isEmpty()) { //--------- 如何做？？？？？？
employee = new Employee();
employee.id(1);
employee.name("Thirumal");
employee.mobile("+91-8973-697-871");
repository.save(employee);
}
如何检查“对象的成员”是否为空/NULL？
英文:
How to check variables of Objects are empty or NULL in JAVA?
Employee employee = repository.getEmployee(id).orElseGet(null);
if (employee == null) {
employee = new Employee();
employee.id(1);
employee.name("Thirumal");
employee.mobile("+91-8973-697-871");
repository.save(employee);
}
Instead of NULL, I am trying to create an object new Employee()
Employee employee = repository.getEmployee(id).orElseGet(new Employee());
if (employee.isEmpty()) { //--------- How to do ????????
employee = new Employee();
employee.id(1);
employee.name("Thirumal");
employee.mobile("+91-8973-697-871");
repository.save(employee);
}
How to check the member of objects are empty/NULL?
答案1
得分: 1
只需将 isEmpty 方法添加到 Employee 类中并在那里实现，或者使用 null 对象模式 代替 new Employee()。
至于您在代码中实际要做的事情，我建议像这样做：
Employee employee = repository.getEmployee(id).orElseGet(() -> {
Employee emp = new Employee();
emp.setId(1);
emp.setName("Thirumal");
emp.setMobile("+91-8973-697-871");
return repository.save(emp);
});
英文:
Just add that isEmpty method to Employee class and implement it there, or use a null object pattern instead of doing new Employee().
As to what you are actually trying to do in your code, I suggest to do it like that instead:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-java -->
Employee employee = repository.getEmployee(id).orElseGet(() -> {
Employee emp = new Employee();
emp.id(1);
emp.name("Thirumal");
emp.mobile("+91-8973-697-871");
return repository.save(emp);
});
<!-- end snippet -->
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