Скачать или смотреть java read excel file into arraylist

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reading an excel file in java can be accomplished using libraries such as apache poi or jexcelapi. in this tutorial, we'll focus on apache poi, as it is widely used and supports both .xls and .xlsx formats.

prerequisites

1. **java development kit (jdk)**: make sure you have java installed on your machine. you can download it from [here](https://www.oracle.com/java/technolog....
2. **apache poi library**: download the apache poi library from [apache poi's official website](https://poi.apache.org/download.html). you will need the following jar files:
`poi-*.jar`
`poi-ooxml-*.jar`
`poi-ooxml-schemas-*.jar`
`xmlbeans-*.jar`
`commons-collections4-*.jar`
`commons-compress-*.jar`

3. **ide**: use any java ide (such as intellij idea, eclipse, or netbeans) to write and run your java code.

step-by-step guide to read an excel file into an arraylist

1. **setup your project**: include the downloaded apache poi jar files in your project's build path.

2. **create an excel file**: for this example, create a simple excel file named `data.xlsx` with the following content:

| name | age | city |
|--------|-----|------------|
| alice | 30 | new york |
| bob | 25 | los angeles |
| charlie| 35 | chicago |

3. **java code**: write the following java code to read the excel file and store the data in an `arraylist`.



explanation of the code

1. **imports**: the necessary classes from apache poi and java are imported.

2. **person class**: this is a simple class that represents a person with `name`, `age`, and `city` attributes. the `tostring()` method is overridden to provide a readable representation.

3. **excelreader class**:
**main method**: this is the entry point of the program.
**file input stream**: opens the excel file for reading.
**workbook and sheet**: a `workbook` object is created to represent the excel file and a `sheet` object to represent the f ...

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