The Integer class in Java is a wrapper class for the primitive type int. It provides a number of methods for converting an integer to a string and a string to an integer, as well as other constants and methods useful when dealing with an int. Understanding these methods is crucial for efficient integer manipulation in Java.
This guide covers various methods available in the Integer class, offering a comprehensive understanding of how to manipulate and interact with integers in Java. These methods are essential for efficient coding practices and help in performing operations like parsing, comparing, and converting integers.
For more detailed information, you can refer to the official Java SE Documentation and additional resources on Java Programming Tutorial.
Java Integer Class Methods
| Method | Description |
|---|---|
| parseInt() | Converts a string to a primitive int. |
| valueOf() | Returns an Integer instance representing the specified int value. |
| intValue() | Returns the value of this Integer as an int. |
| toString() | Returns a string representation of the integer. |
| compareTo() | Compares two Integer objects numerically. |
| getInteger() | Determines the integer value of the system property with the specified name. |
| bitCount() | Returns the number of one-bits in the two’s complement binary representation of the specified int value. |
| byteValue() | Returns the value of this Integer as a byte. |
| longValue() | Returns the value of this Integer as a long. |
| floatValue() | Returns the value of this Integer as a float. |
| doubleValue() | Returns the value of this Integer as a double. |
| toBinaryString() | Returns a string representation of the integer argument as an unsigned integer in base 2. |
| reverse() | Returns the value obtained by reversing the order of the bits in the two’s complement binary representation of the specified int value. |
| sum() | Adds two integers together as per the + operator. |
| decode() | Decodes a String into an Integer. |
| rotateLeft() | Returns the value obtained by rotating the two’s complement binary representation of the specified int value left by the specified number of bits. |
| rotateRight() | Returns the value obtained by rotating the two’s complement binary representation of the specified int value right by the specified number of bits. |
| parseUnsignedInt() | Parses the string argument as an unsigned decimal integer. |
| toOctalString() | Returns a string representation of the integer argument as an unsigned integer in base 8. |
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