Скачать или смотреть java read file properties

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certainly! in java, you can read properties from a file using the `properties` class, which is part of the `java.util` package. this class allows you to manage a set of key-value pairs, making it useful for configuration files.

step-by-step tutorial on reading file properties in java

#### step 1: create a properties file

first, you need a properties file. create a file named `config.properties` with the following content:



#### step 2: java code to read properties

next, you can write a java program to read the properties from this file. here’s how to do it:



explanation of the code

1. **imports**: we import necessary classes from the `java.io` and `java.util` packages.

2. **properties object**: we create an instance of the `properties` class, which will hold our key-value pairs.

3. **fileinputstream**: we use `fileinputstream` to read the properties file. make sure the file path is correct. if the file is in the same directory as your java class, you can use just the filename.

4. **loading properties**: we call the `load()` method on the `properties` object, passing the `inputstream`. this reads the properties from the file.

5. **retrieving properties**: we use the `getproperty()` method to retrieve the values associated with specific keys.

6. **exception handling**: we handle `ioexception` to catch potential errors while reading the file.

step 3: running the code

1. ensure you have the `config.properties` file in the correct path.
2. compile the java program using:

3. run the program using:


you should see output similar to this:



conclusion

you have now successfully created a java application that reads properties from a file using the `properties` class. this technique is commonly used for configuration purposes, allowing you to separate configuration data from your code. you can easily modify the properties file without changing the code, making your application more flexible and maintainable.

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