Unit Testing of Classes in Java
Every class can have a main method. That is a handy trick for unit testing of classes. For example, you can add a main method to the Employee class:
test.java :
import java.util.*;
import java.time.*;
class Employee
{
String name;
double salary;
LocalDate hireday;
public Employee(String n, double s, int year, int month, int day)
{
name = n;
salary = s;
}
public static void main(String[] args)
{
Employee e = new Employee("Romeo", 50000, 2003, 3, 31);
System.out.println(e.name);
}
}
After compilation javac test.java
:
If you want to test the Employee class in isolation, simply execute
java Employee
If the Employee is a part of a larger application, you start the application with
java Application
and the main method of the Employee class is never executed.
这个方法可以用来调试Java子程序和Class,而不用每次都新建一个完整的Application。
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