CODEWITHSUNDEEP
javajvm
BufBills
BufBills

Reputation: 8103

in java, is non-initialized object guarantee to be null?

public class T146 { //LRU Cache

private HashMap<Integer, DoubleLinkedListNode> map 
    = new HashMap<Integer, DoubleLinkedListNode>();
private DoubleLinkedListNode head;
private DoubleLinkedListNode end;
private int capacity;
private int len;

public LRUCache(int capacity) {
    this.capacity = capacity;
    len = 0;
}

}

For this data structure. if I initilized a instance of T146. Without setting t146.head = null. can jvm guarantee t146.head is null? THanks!

Upvotes: 0

Views: 49

Answers (1)

user207421
user207421

Reputation: 310913

in java, is non-initialized object guarantee to be null?

Any non-initialized reference variable is guaranteed to be null if it's a class or instance member. Local variables have no default values at all, but the compiler will tell you if you try to use one before it's been initialized.

Upvotes: 1

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