Guidelines for method calling in Java test classes

How to call methods in Java test classes

Java is an object-oriented programming language that provides a wealth of functions and methods to achieve various tasks. When writing Java programs, you often need to call methods in other classes to implement specific functions. To ensure that the method being called is working properly, we need to run tests to verify its correctness. In Java, you can use test classes to call various methods for unit testing. Below we will introduce how to call methods in Java test classes and give specific code examples.

Step 1: Create a test class

First, create a test class in the Java project. The test class is a class corresponding to the class to be tested and is used to test the methods in the class to be tested.

public class MyTestClass {
    
    public static void main(String[] args) {
        // 在这里编写单元测试代码
    }
}

Step 2: Import the class to be tested

In the test class, you need to import the package of the class to be tested. By importing the class under test, we can call methods in the class under test in the test class.

import com.example.MyClass; // 导入待测试类的包

Step 3: Create an object of the class to be tested

In order to be able to call methods in the class to be tested, we need to create an object of the class to be tested in the test class.

MyClass myObj = new MyClass(); // 创建待测试类的对象

Step 4: Call the method in the class to be tested

Through the object of the class to be tested, we can call the method in the class to be tested. Methods are called in the same way as in the class under test.

myObj.myMethod(); // 调用待测试类中的方法

Example:

Now, suppose we have a class to be tested called Calculator, which contains a method that calculates the sum of two numbers. The following is the code of the class to be tested:

public class Calculator {
    
    public int add(int a, int b) {
        return a + b;
    }
}

Now, we need to call the add method of the Calculator class in a test class to test its correctness. We can write the test code according to the above steps:

import com.example.Calculator;

public class CalculatorTest {
    
    public static void main(String[] args) {
        Calculator calculator = new Calculator(); // 创建Calculator类的对象
        int result = calculator.add(2, 3); // 调用add方法并传入参数
        System.out.println("计算结果是：" + result); // 输出结果
    }
}

By running the above test class, we can verify whether the add method of the Calculator class correctly calculates the sum of two numbers.

To sum up, we can call methods in Java test classes by creating test classes, importing the class to be tested, creating objects of the class to be tested, and calling methods in the class to be tested. In this way we can verify whether the methods in the class to be tested work correctly and ensure the correctness of the program.

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