The Integer class in Java is a wrapper class for the primitive data type int. It provides several useful methods for working with integer values, such as parsing, comparing, and converting to other data types. Understanding these methods can help you perform common tasks more efficiently in your Java programs.
This guide covers various methods available in the Integer class. Each method is described in simple terms to help beginners understand how to use them. These methods enable you to perform operations like bit manipulation, conversion between different bases, and arithmetic operations.
For more detailed information, please refer to the official Java SE Documentation and additional resources on Java Wrapper Classes Tutorial.
Java Integer Class Methods
The table below contains various methods of the Java Integer class, each with a link to a detailed explanation, examples, and real-world uses. Click on the method names to learn more about how to use them effectively in your applications.
| Method | Description |
|---|---|
| bitCount() | Returns the number of one-bits in the two's complement binary representation of the specified int value. |
| byteValue() | Converts this Integer to a byte. |
| compareTo() | Compares two Integer objects numerically. |
| decode() | Decodes a String into an Integer. |
| doubleValue() | Returns the value of this Integer as a double. |
| floatValue() | Returns the value of this Integer as a float. |
| getInteger() | Determines the integer value of the system property with the specified name. |
| intValue() | Returns the value of this Integer as an int. |
| longValue() | Returns the value of this Integer as a long. |
| parseInt() | Parses the string argument as a signed decimal integer. |
| parseUnsignedInt() | Parses the string argument as an unsigned decimal integer. |
| reverse() | Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified int value. |
| 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. |
| sum() | Returns the sum of its arguments. |
| toBinaryString() | Returns a string representation of the integer argument as an unsigned integer in base 2. |
| toOctalString() | Returns a string representation of the integer argument as an unsigned integer in base 8. |
| toString() | Returns a string representation of the integer argument as a signed decimal integer. |
| valueOf() | Returns an Integer instance representing the specified int value. |
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