How to convert an integer to an octal string using toOctalString() method of Integer class

How to use the toOctalString() method of the Integer class to convert an integer into an octal string

Introduction
In program development, sometimes it is necessary to convert an integer into an octal string. The Integer class in Java provides the toOctalString() method, which can easily convert integers into octal strings. This article will introduce how to use the toOctalString() method of the Integer class to perform octal conversion and provide relevant code examples.

Usage of toOctalString() method
The toOctalString() method of the Integer class is used to convert an integer into an octal string. The declaration of this method is as follows:

public static String toOctalString(int i)

Among them, the parameter i represents the integer to be converted. This method returns a string representing the octal form of parameter i.

Code Example
The following is a code example using the toOctalString() method for octal conversion:

public class OctalConversionExample {

public static void main(String[] args) {
    int num = 12345;
    String octalStr = Integer.toOctalString(num);
    System.out.println("八进制字符串：" + octalStr);
}

}

In the above code, an integer num is first defined, whose value is 12345. Then, call the toOctalString() method of the Integer class to convert num to an octal string and store the result in the octalStr variable. Finally, use the System.out.println() method to output the octal string to the console.

Run the above code, the output result is as follows:

Octal string: 30071

Explanation
As can be seen from the output result, the integer 12345 is converted into octal characters String "30071".

Notes
When using the toOctalString() method for octal conversion, you need to pay attention to the following points:

1. The toOctalString() method can only handle integers of type int. If the number to be converted is of long type, it needs to be converted to int type before conversion.
2. If the integer to be converted is a negative number, the toOctalString() method will convert it into the octal form of the corresponding positive number and add a minus sign "-" in front to indicate a negative number.
3. Each digit of the octal number consists of 0~7.

Summary
This article describes how to use the toOctalString() method of the Integer class to convert an integer to an octal string. Through the code examples given, we can clearly understand how to use this method for octal conversion. At the same time, you also need to pay attention to the parameter type of the method, the processing of negative numbers, and the representation rules of octal numbers. By rationally using this knowledge, we can easily complete the octal conversion needs in program development.

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