Quiz on Call by Value and Call by Reference in Java

What kind of parameter passing does Java support?

What is actually passed when an object is passed to a method?

What will be the output of the following code?

void update(int x) { x = 100; }
int a = 50;
update(a);
System.out.println(a);

When you pass an object to a method, which statement is true?

Which of the following can be modified inside the method?

Which behavior below is consistent with Java’s memory model?

What will be printed?

void change(String str) { str = “Java”; }
String s = “Code”;
change(s);
System.out.println(s);

What happens when you reassign a reference inside a method?

Which of these types are passed by value in Java?

What is the primary reason for confusion in Java’s parameter passing?

Which of these changes the original object’s state?

What is printed?

class Test { int x = 1; }
void modify(Test t) { t.x = 5; }
Test t1 = new Test();
modify(t1);
System.out.println(t1.x);

When can Java simulate call by reference?

Which method modifies the original array?

void process(int[] arr) { arr[0] = 99; }
int[] nums = {1, 2};
process(nums);
System.out.println(nums[0]);

What will be the result of this code?

void reassign(Object obj) { obj = new Object(); }
Object myObj = new Object();
reassign(myObj);
System.out.println(myObj.hashCode());