Java如何将BigDecimal类型的值转成double类型

import java.math.BigDecimal;

public class Main {
    public static void main(String[] args) {
        BigDecimal bigDecimal = new BigDecimal("12345.6789");

        // 将 BigDecimal 转换为 double
        double doubleValue = bigDecimal.doubleValue();

        System.out.println("BigDecimal value: " + bigDecimal);
        System.out.println("Double value: " + doubleValue);
    }
}

import java.math.BigDecimal;

public class Main {
    public static void main(String[] args) {
        BigDecimal bigDecimal1 = new BigDecimal("12345.6789");
        BigDecimal bigDecimal2 = new BigDecimal("1.2345678901234567890123456789E+20");

        // 将 BigDecimal 转换为 double
        double doubleValue1 = bigDecimal1.doubleValue();
        double doubleValue2 = bigDecimal2.doubleValue();

        System.out.println("BigDecimal value 1: " + bigDecimal1);
        System.out.println("Double value 1: " + doubleValue1);
        System.out.println("BigDecimal value 2: " + bigDecimal2);
        System.out.println("Double value 2: " + doubleValue2);
    }
}

public class Test {
	public static void main(String args[]) {
		double b_OLD = 4.1625;
		<a target="_blank" href="http://zhidao.baidu.com/search?word=java.math&fr=qb_search_exp&ie=utf8" rel="nofollow">java.math</a>.BigDecimal bd1 = new <a target="_blank" href="http://zhidao.baidu.com/search?word=java.math&fr=qb_search_exp&ie=utf8" rel="nofollow">java.math</a>.BigDecimal( b_OLD );
		System.out.println("BEFORE ROUNDING: " + bd1);
	}
}