Question
public class ArrayTest
{
public static void main(String[ ] args)
{
float f1[ ], f2[ ];
f1 = new float[10];
f2 = f1;
System.out.println("f2[0] = " + f2[0]);
}
}
What will be the output of the program?
public class ArrayTest
{
public static void main(String[ ] args)
{
float f1[ ], f2[ ];
f1 = new float[10];
f2 = f1;
System.out.println("f2[0] = " + f2[0]);
}
}
Answer: Option A
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Option A is correct. When you create an array (f1 = new float[10];) the elements are
initialises to the default values for the primitive data type (float in this case - 0.0), so
f1 will contain 10 elements each with a value of 0.0. f2has been declared but has not
been initialised, it has the ability to reference or point to an array but as yet does not
point to any array. f2 = f1; copies the reference (pointer/memory address) of f1 into f2
so now f2 points at the array pointed to by f1.
This means that the values returned by f2 are the values returned by f1. Changes to f1
are also changes to f2because both f1 and f2 point to the same array.
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