Comparing Strings with "==" instead of equals() method is a common mistake made by new Java developers. What makes it interesting is that "String literal" when compared with "==" works perfectly fine, which makes Java developers think that it is the correct way of comparing Strings which in fact is not. Actually, "==" operator returns true if both the operands point to the same String object. When we create a String literal, a new String object is not created every time. First it is searched in the pool if that object is already present. If it is present, that object is returned. If it is not present, a new object is created and added to the pool. So, "==" operator works fine if both the operands are String literals. To avoid subtle bugs, we should always compare Strings using equals() method.
The following Java program makes it clear :
The following Java program makes it clear :
No comments:
Post a Comment