Home » Java » Assertions
1. 

What will be the output of the program? 

public class Test 
{
    public static int y;
    public static void foo(int x) 
    {
        System.out.print("foo ");
        y = x;
    }
    public static int bar(int z) 
    {
        System.out.print("bar ");
        return y = z;
    }
    public static void main(String [] args ) 
    {
        int t = 0;
        assert t > 0 : bar(7);
        assert t > 1 : foo(8); /* Line 18 */
        System.out.println("done ");
    }
}

A. bar
B. bar done
C. foo done
D. Compilation fails
2.  

public class Test 
{ 
    public void foo() 
    {
        assert false; /* Line 5 */
        assert false; /* Line 6 */
    } 
    public void bar()
    {
        while(true)
        {
            assert false; /* Line 12 */
        } 
        assert false;  /* Line 14 */
    } 
}
What causes compilation to fail?
A. Line 5
B. Line 6
C. Line 12
D. Line 14
3.  

public class Test2 
{
    public static int x;
    public static int foo(int y) 
    {
        return y * 2;
    }
    public static void main(String [] args) 
    {
        int z = 5;
        assert z > 0; /* Line 11 */
        assert z > 2: foo(z); /* Line 12 */
        if ( z < 7 )
            assert z > 4; /* Line 14 */

        switch (z) 
        {
            case 4: System.out.println("4 ");
            case 5: System.out.println("5 ");
            default: assert z < 10;
        }

        if ( z < 10 )
            assert z > 4: z++; /* Line 22 */
        System.out.println(z);
    }
}
which line is an example of an inappropriate use of assertions?
A. Line 11
B. Line 12
C. Line 14
D. Line 22