Trying to get AssertionError

[Sami Devine]

Hi I am trying to get AssertionError. Why does the following run?

class Astest{
    public static void main(String [] args){
       //String s1 = new String("Hello");
       //String s2 = new String("Jello");
       int i = 1;
       int j = -1;
       assert (i == j);
       System.out.println("Assert");
}
}
[code=java]

[Yunnan Zhou]

your junit Test must be like this

import org.junit.Assert;
import org.junit.Test;

public class TestDemo {
	@Test
	public void test1(){
		int i = 1;
		int j = 1;
		Assert.assertEquals(i, j);
	}
}

check you jar file

[Ernest Friedman-Hill]

Yunnan Zhou wrote:your junit Test must be like this

Indeed, that would be a JUnit test; but we're talking about Java assertions, another topic altogether.

Assertions are turned off by default; you must enable them by providing the -ea switch to java when you run it:

java -ea Astest

[Sami Devine]

Ernest, thank you. this worked.
Yunnan thanks

[Yunnan Zhou]

I got it .
I looked up some materials.
if you assert false, a java.lang.AssertionError will be throwed,and if you assert true,it will run well

[Rob Spoor]

But you have to enable assertions as Ernest has shown.