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Cleaning Data in Java

中級スキルレベル

更新日 2025/12

Master data cleaning in Java using statistical methods, transformations, and validation for reliable apps.

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JavaImporting & Cleaning Data4時間13 ビデオ39 演習3,250 XP達成証明書

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コース説明

Cleaning data is crucial for business problems. When data quality suffers, analytics become unreliable, machine learning models make poor predictions, and business decisions go awry.This course equips you with Java tools to tackle data quality head-on. You'll learn statistical methods to spot outliers and handle missing values, master data transformations from standardizing text to managing dates across time zones, and implement range checks using regular expressions and validation annotations.Working with Tablesaw, you'll clean real-world tabular data and perform transformations that prepare data for analysis. You'll finish ready to ensure data quality at every step of your applications.

前提条件

Data Types and Exceptions in Java

1

Assessing Data Quality

Learn essential techniques for assessing data quality in Java applications. Discover how to use descriptive statistics to identify outliers, detect and handle missing values appropriately, and validate data types to prevent errors. Master key tools like DescriptiveStatistics for numerical analysis, Optional for null handling, and DateTimeFormatter for date validation.

Data statistics

Computing mean, min, max

Computing percentiles

Null detection

Detecting missing numbers

Detecting missing strings

Data type verification

Parsing text into dates and numbers

Reading CSV files safely

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2

Transforming Data

Master data transformation techniques for reliable Java applications. Learn to normalize strings using regular expressions for consistent text matching, standardize categories with EnumMap and HashMap for robust lookup tables, and handle date formats using Java's time API with LocalDate and ZoneId for consistent date handling across time zones.

String normalization

Regular expressions

Cleaning strings

Categorical standardization

Building a category mapping

Grouping by standardized categories

Date standardization

Standardizing dates

Converting time zones

Extracting month and year from dates

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3

Validating Data

Ensure data quality through validation techniques. Learn to implement range validation for numeric values and dates, master pattern validation using regular expressions to verify data formats, and apply constraint validation to enforce business rules.

Range validation

Validating numeric ranges

Validating date ranges

Pattern validation

Full pattern matching

Pattern finding

Character matching

Constraint enforcement

Annotations with video game sales

Displaying validation messages

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4

Cleaning Tabular Data

Transform messy tabular data into clean, usable datasets with Tablesaw, a powerful Java library. You'll assess data quality, standardize column contents, and apply filtering operations to prepare your data. By the end, you'll confidently turn raw datasets into analysis-ready tables.

Data quality assessment with Tablesaw

Analyzing missing and unique values

Analyzing numeric columns

Column cleaning and standardization

Transforming numeric data

Transforming text data

Column filtering and aggregation

Filtering columns

Aggregating columns

Congratulations!

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Cleaning Data in Java

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19百万人を超える学習者と一緒にCleaning Data in Javaを今日から始めましょう！

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または

続行すると、弊社の利用規約、プライバシーポリシーに同意し、データが米国に保存されることに同意したことになります。

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