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DE99℅ of Beginners Fail this Simple Java Math..Can you guess the output? #DevJava #facts s #CodingLife #trickyquestions
Output kya hoga? 1 ya 99? 🤔
If you guessed A (1), you just fell for one of the most common Array traps in Java!
The correct answer is actually B) 99.
Here is the secret you need to know before starting DSA:
In Java, arrays are objects. When you create arr1, Java stores the actual numbers {1, 2, 3} in memory, and arr1 just holds the address (reference) to that memory location.
When you write int[] arr2 = arr1;, Java does NOT create a new copy of the array. It simply gives arr2 the exact same memory address!
So, arr1 and arr2 are now pointing to the exact same list in memory. If you change the first number using arr2[0] = 99, you are changing the actual list. When arr1 looks at that list later, it sees the 99!
If you want a real, separate copy, you have to use arr1.clone().
Did you think they were separate arrays? Let me know in the comments! 👇
Follow @Dev.Java to build your DSA logic and master Java from scratch!
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![#Second Largest Element In The Array Reel by @java_fullstack_ - 9. What will be the output?
Java
Copy code
class Test {
int x;
Test() {
System.out.println(x);
}
public static void main(String[] args) {
ne](https://image.pictame.com/img/640209205_1974386400127935_3740436722607360769_n.jpg?hash=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)
