Garbage Collections - Programming

Garbage Collections - General Questions
Garbage Collections - Pointing out the correct statements

public class X 
{
    public static void main(String [] args) 
    {
        X x = new X();
        X x2 = m1(x); /* Line 6 */
        X x4 = new X();
        x2 = x4; /* Line 8 */
        doComplexStuff();
    }
    static X m1(X mx) 
    {
        mx = new X();
        return mx;
    }
}

After line 8 runs. how many objects are eligible for garbage collection?

A 0

B 1

C 2

D 3

ANS:A - 0

By the time line 8 has run, the only object without a reference is the one generated as a result of line 6. Remember that 'Java is pass by value,' so the reference variable x is not affected by the m1() method. Ref: http://www.javaworld.com/javaworld/javaqa/2000-05/03-qa-0526-pass.html

Garbage Collections - Programming

`public class X { public static void main(String [] args) { X x = new X(); X x2 = m1(x); /* Line 6 / X x4 = new X(); x2 = x4; / Line 8 */ doComplexStuff(); } static X m1(X mx) { mx = new X(); return mx; } }`
After line 8 runs. how many objects are eligible for garbage collection?

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Garbage Collections - Programming

public class X { public static void main(String [] args) { X x = new X(); X x2 = m1(x); /* Line 6 */ X x4 = new X(); x2 = x4; /* Line 8 */ doComplexStuff(); } static X m1(X mx) { mx = new X(); return mx; } } After line 8 runs. how many objects are eligible for garbage collection?

Solution

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`public class X { public static void main(String [] args) { X x = new X(); X x2 = m1(x); /* Line 6 / X x4 = new X(); x2 = x4; / Line 8 */ doComplexStuff(); } static X m1(X mx) { mx = new X(); return mx; } }`
After line 8 runs. how many objects are eligible for garbage collection?

For help Students Orientation
Mcqs Questions