Understanding the Distinction between parseInt() and valueOf()
When converting a String to a primitive numeric value in Java, you have the options of parseInt() and valueOf(). While both methods provide seemingly identical functionality, they differ in fundamental ways.
Difference between parseInt() and valueOf()
Which to Use: Convention and Preference
In general, parseInt() is preferred when you specifically need a primitive int, such as when working with arrays or memory-intensive calculations. valueOf() is more suitable when you need the resulting object, for example, when performing operations on collections or comparing numeric values.
Example
Let's demonstrate the difference:
<code class="java">int i = Integer.parseInt("123"); // Primitive int value Integer j = Integer.valueOf("456"); // New Integer object</code>
Important Considerations
However, it's worth noting that parseInt() is more efficient for parsing because it directly converts the String to an int without creating an intermediate object. If you need both efficiency and object-oriented features, consider using valueOf(int) to obtain the cached Integer object from the primitive value:
<code class="java">Integer k = Integer.valueOf(Integer.parseInt("123")); // Caches the Integer value</code>
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