Java 中 BigDecimal toEngineeringString()方法，带示例

原文:https://www . geesforgeks . org/big decimal-to engineeringstring-method-in-Java-with-examples/

T2。toEngineeringString() 方法用于表示当前的 BigDecimal，如果需要指数，则使用工程符号将该方法调用为字符串形式。BigDecimal 的字符串表示与 toString() 方法中描述的相同，只是如果使用指数表示法，十的幂被调整为三的倍数(工程表示法)，这样非零值的整数部分将在 1 到 999 的范围内。 语法:

public String toEngineeringString()

参数:该方法不接受任何参数。 返回值:这个方法返回这个大十进制数的工程字符串表示。

下面的程序说明了如何在 java 中使用 toEngineeringString()方法 示例 1: 示例将 BigDecimal 转换为无指数符号的工程字符串

// Java program to demonstrate
// toEngineeringString() method of BigDecimal

import java.math.*;

class GFG {
    public static void main(String[] args)
    {
        // Creating a BigDecimal object
        BigDecimal b;

        // Object of String to hold the number
        String input = "012345678901234567"
                       + "8901234567890123"
                       + "4567890123456789"
                       + "0123456789012345"
                       + "6789012345678901"
                       + "2345678901234567"
                       + "8901234567890123"
                       + "4567890123456789"
                       + "0123456789012345"
                       + "6789012345678901"
                       + "2345678901234567"
                       + "8901234567890123"
                       + "4567890123456789"
                       + "0123456789012345"
                       + "6789012345678901"
                       + "2345678901234567"
                       + "8901234567890123"
                       + "4554324324362432"
                       + "7674637264783264"
                       + "7832678463726478"
                       + "4635463263453264"
                       + "654632498739473";

        // Converting to BigDecimal
        b = new BigDecimal(input);

        // Apply toEngineeringString() method
        String s = b.toEngineeringString();

        // Print the result
        System.out.println(s);
    }
}

Output:

1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901 2345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345543243243624327674637264783 26478326784637264784635463263453264654632498739473

例 2: 用指数表示法将 BigDecimal 转换为工程字符串的示例

// Java program to demonstrate
// toEngineeringString() method of BigDecimal

import java.math.*;

class GFG {
    public static void main(String[] args)
    {

        // Create a BigDecimal object
        BigDecimal a = new BigDecimal("4536785E10");

        // Create a String object
        String s;

        // apply toEngineeringString() method
        s = a.toEngineeringString();

        // print the result
        System.out.println(s);
    }
}

Output:

45.36785E+15

参考文献:https://docs . Oracle . com/en/Java/javase/12/docs/API/Java . base/Java/math/bigdecimal . html # to engineereingstring()

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