OMG! Tablesaw, a Java data visualization library!

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##This article is suitable for people who have just learned the basics of the Java language , follow this article to understand and use Tablesaw projects. The examples are all demonstrated under the Windows operating system

Tablesaw

Project source code address: github.com/jtablesaw/t…

aggregate: Maven's project parent project, mainly defines the configuration of project packaging.
1. beakerx: The registry of the tablesaw library, the main registry and columns.
2. core: The core code of the tablesaw library, mainly data processing operations: data appending, sorting, grouping, query, etc.
3. data: Project test data directory.
4. docs: Project MarkDown documentation directory.
5. docs-src: Project document source code directory, its main function is to generate MarkDown documents.
6. excel: A sub-project that parses excel file data.
7. html: A sub-project that parses html file data.
8. json: A sub-project that parses json file data.
9. jsplot: A sub-project of data visualization, its main function is to load data and generate visual charts.
10. saw: tablesaw sub-project for reading and writing chart data.

 tech.tablesaw tablesaw-core LATEST复制代码

@Testpublic void tableSawTest6() { String[] students = {"小明", "李雷", "小二"}; double[] scores = {90.1, 84.3, 99.7}; Table table = Table.create("学生分数统计表").addColumns( StringColumn.create("姓名", students), DoubleColumn.create("分数", scores)); System.out.println(table.print()); }复制代码

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##2.2.2 Load the data file to create the data table

@Testpublic void tableSawTest10() throws Exception{ Table table = Table.read().csv("/data/bush.csv"); Table whoPercents = table.xTabPercents("who"); whoPercents.columnsOfType(ColumnType.DOUBLE) .forEach(x -> ((NumberColumn) x).setPrintFormatter( NumberColumnFormatter.percent(0))); System.out.println(whoPercents.toString()); }复制代码

First

Load data files, loading data supports csv, database result sets, files, URLs, etc.Specify the fields of the x-axis of the table, and convert the data into percentage data.

The content of the bash.csv file is as follows:

Table robberies = Table.read().csv("./data/boston-robberies.csv"); Plot.show( AreaPlot.create( "Boston Robberies by month: Jan 1966-Oct 1975", robberies, "Record", "Robberies"));复制代码

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Table.read

AreaPlot.create, and thenPlot. showGenerate the html page of the chart locally and automatically open the browser for display.boston-robberies.csv file content is as follows:

Find the unit test code of the project in the source code. Then, we import the project into the development tool and directly run the unit tests in the project.

This tutorial is for those who have a certain Java programming foundation. If your project happens to require a data visualization library, the Tablesaw library is a good choice!

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