New in Java 12: How to format numbers using Compact Number Format

Java, a programming language widely used for development, has introduced many new and exciting features in its latest version, Java 12. One of them is the new feature Compact Number Format. Compact Number Format is a method of formatting numbers into a more readable and understandable form based on their size. In this article, we will explain the usage of Compact Number Format in detail and show how to use it in Java 12 with some sample code.

In Java 12, the function of Compact Number Format is implemented through the CompactNumberFormat class in the java.text package. We first need to create a CompactNumberFormat object, which can then be used to format numbers.

The following is a simple example code that shows how to create a CompactNumberFormat object and format a number into compact form:

import java.text.CompactNumberFormat;
import java.util.Locale;

public class CompactNumberFormatExample {

    public static void main(String[] args) {
        // 创建一个CompactNumberFormat对象，并指定Locale为英文
        CompactNumberFormat format = CompactNumberFormat.getInstance(Locale.ENGLISH);

        // 格式化数字
        String formattedNumber = format.format(1000);

        // 输出结果
        System.out.println(formattedNumber);
    }
}

This code creates a CompactNumberFormat object and specifies the Locale for English. Then, we use the format() method to format the number 1000. Finally, we output the formatted results. In this example, the output will be "1K", which is the compact form of 1000.

Compact Number Format can not only handle integers, but also floating point numbers. Here is a sample code that shows how to format a floating point number into a compact form:

import java.text.CompactNumberFormat;
import java.util.Locale;

public class CompactNumberFormatExample {

    public static void main(String[] args) {
        // 创建一个CompactNumberFormat对象，并指定Locale为英文
        CompactNumberFormat format = CompactNumberFormat.getInstance(Locale.ENGLISH);

        // 格式化浮点数
        String formattedNumber = format.format(1000.50);

        // 输出结果
        System.out.println(formattedNumber);
    }
}

In this example, we used a floating point number of 1000.50 for formatting. The output will be "1K", which is the compact form of 1000.50.

Compact Number Format also supports more options and can be customized as needed. For example, we can set the maximum magnitude of a number so that the full number is displayed when that magnitude is exceeded. The following is a sample code that demonstrates how to customize the options of Compact Number Format:

import java.text.CompactNumberFormat;
import java.util.Locale;

public class CompactNumberFormatExample {

    public static void main(String[] args) {
        // 创建一个CompactNumberFormat对象，并指定Locale为英文
        CompactNumberFormat format = CompactNumberFormat.getInstance(Locale.ENGLISH);

        // 设置数字的最大数量级为万
        format.setMaximumVisibleDigits(3);

        // 格式化数字
        String formattedNumber = format.format(100000);

        // 输出结果
        System.out.println(formattedNumber);
    }
}

In this example, we set the maximum magnitude of the number by calling the setMaximumVisibleDigits() method. 3, means that only numbers over 1000 will be formatted into compact form. So, after formatting the number 100000, the output will be "100,000" instead of the compact form.

In summary, the Compact Number Format feature introduced in Java 12 makes number formatting more flexible and easier to read. Through the sample code in this article, you can learn how to use Compact Number Format to format numbers in Java programs. This new feature can greatly improve the user experience of the application and provide more options for digital expression. If you are developing an application that needs to deal with numbers, then Compact Number Format is a good choice. Try it now and experience its powerful features!

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