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Programming Theory

Programming theory deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features, along with introductory programming concepts like program structure, variable declaration and conditional and looping constructs. Sub-disciplines include the formal semantics of programming languages, type theory, program analysis and transformation, comparative programming language analysis, metaprogramming, domain-specific languages, compiler construction and run-time systems.

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hi,
I was writing below example
https://www.youtube.com/watch?v=ShO_Z64sGwI&list=PLZM-6wiKGRfGmXzuR8uX3UsE8g91K6Vp1&index=5

package com.gp.mockito;

import org.junit.Before;
import org.junit.Test;
import junit.framework.Assert;
import static org.mockito.Mockito.*;

public class CalculatorServiceTest {

	CalculatorService calService;
	
	@Before
	public void setup(){
		ICalculator cal_mock = mock(ICalculator.class);
		when(cal_mock.add(2, 4)).thenReturn(6);
		calService=new CalculatorService();
		//calService.setCal(cal_mock);
		
		
	}
	@Test
	public void testAddNumbers(){
		Assert.assertEquals(6, calService.addTwoNumbers(2,4));
	}
}

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package com.gp.mockito;

public class CalculatorService {
ICalculator cal;
public ICalculator getCal() {
	return cal;
}
public void setCal(ICalculator cal) {
	this.cal = cal;
}
public int addTwoNumbers(int x, int y){
	return cal.add(x, y);
}
}

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package com.gp.mockito;

public interface ICalculator {
public int add(int x,int y);
}

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why we need setter for calservice implementation class.

why are they setting interface mock object to the calservice object

observerd one example here
https://www.youtube.com/watch?v=DyuWgBHfxNQ

i do not see any setter here though?
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Programming Theory

Programming theory deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features, along with introductory programming concepts like program structure, variable declaration and conditional and looping constructs. Sub-disciplines include the formal semantics of programming languages, type theory, program analysis and transformation, comparative programming language analysis, metaprogramming, domain-specific languages, compiler construction and run-time systems.