The following program produces 4 lines of output. Write each line of output belo

Question

The following program produces 4 lines of output. Write each line of output below as it would appear on the console. import javaui / for Arrays class public class Island int lat; int Ing: public Island(int initialLat, int initialLng) f lat ung initiallat; initia!Lng; public class ReferenceMystery( public static void main(StringI1 args) int n=4; int[] a = {8, 15); Island isle new Island(16, 23); mystery(n, a, isle) System out.printinth"+Arrays. tostringfa)isle. latiste. Ing); isle. lat 42; mystery(n, a, isle); System.out.println(nArrays. tostring(a)+isle. lat public static void mystery(int n, intl a, Island isle) t isle. lng += 100; System.out.println(nArrays. tostring(a)"+isle. lat iste. Ing);

Explanation / Answer

Output:

2 [8, 16] 16 123

5 [8, 16] 16 123

4 [10, 17] 42 223

6 [10, 17] 42 223

Explanation:

Since main is a static method and the variables defined inside the static method are also static variables. The idea of static varaibles is there will be only a

one copy of variable available for all the objects that you create on this class which means if you made a change to static variable then it will effect to all parts

of the class. That is the reason why even though the mystery function changing the values of arguments it got but the change the value is reflecting in main method also since they are static variables.

Nad here n value will not change as per changes in method since t is not a reference type like array and isle object.

public static void main(String[] args) {

int n=4;

int a[]={8,15};

Island isle= new Island(16,23);

mystery(n,a,isle);

n++;

System.out.println(n+" "+Arrays.toString(a)+" "+isle.lat+" "+isle.lng);

n++;

a[0]+=2;

isle.lat=42;

mystery(n, a, isle);

System.out.println(n+" "+Arrays.toString(a)+" "+isle.lat+" "+isle.lng);

}

public static void mystery(int n, int[] a, Island isle) {

n=n-2;

a[1]++;

isle.lng+=100;

System.out.println(n+" "+Arrays.toString(a)+" "+isle.lat+" "+isle.lng);

}

if you look at the code you have value of n as 4 and a[0] is 8 and a[1] is 15 and isle.lat is 16 and isle.lng is 23 and here we are passing these as arguments to mystery function

inside mystery function e are decrementing n by 2 now n =2 since n is static variable it will reflect all the class so even if you access n inside main also it will be 2 only

similarly incrementing a[1] by 1 that is 15 will be changed to 16 and adding 100 to isle.lng so it will be 123 and now we are printing this and it will print

2 [8, 16] 16 123

After control comes back to main and here n value doesnot change since it is not a reference type so in main the n value will be 4 only and now we are incrementing the

value of n by 1 and now we are printing it will print 5 [8, 16] 16 123

the same holds for remaining part of code.

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