Debug Mode in Eclipse for Java (Video)

Debug mode lets you run programs and watch how the instructions in your program’s source code are executed. It also lets you see the values of variables and attributes, and you can change those values to force possible errors or exceptions in your program.

In this post we are going to show how to "debug" a program written in Java with the Eclipse IDE. To do that, we will need to use what are known as "BreakPoints", which are stop points that we put in our code so we can navigate through it while it runs.

To move through the code step by step we will use the F5, F6, F7 and F8 keys, which correspond to the following buttons in the IDE:

Below you have the video tutorial so you can see how debug mode works in Java:

We copy the program code below (we are not sharing the project, since it is a simple example program with no functionality at all):

public class Debuger {

	public static void main (String args[]){

		String primerString = " ";
		int contador = 10;
		boolean flag = true;

		for (int i=1; i<contador; i++){
 			primerString = "Numero "+i;
 			System.out.println(primerString);
 		} 		

 		while (flag){
			primerString = "Numero "+contador;
 			System.out.println(primerString);
 			contador++;
		if(contador>20)
			flag = false;
		}
	}
}