Java BigDecimal subtract()用法及代码示例

java.math.BigDecimal.subtract(BigDecimal val)用于计算两个BigDecimal的算术差。该方法用于查找大数的算术差异，而不会影响结果的精度。此方法对当前的BigDecimal执行操作，通过该操作调用此方法并将BigDecimal作为参数传递。

Java中有两种减法方法重载，如下所示：

subtract(BigDecimal val)
subtract(BigDecimal val, MathContext mc)

subtract(BigDecimal val)

用法:

public BigDecimal subtract(BigDecimal val)

参数：此方法接受参数val，该参数是要从此BigDecimal中减去的值。

返回值：此方法返回一个BigDecimal，该BigDecimal保留差异(this – val)，其小数位数为max(this.scale()，val.scale())。

下面的程序用于说明BigDecimal的subtract()方法。

// Java program to demonstrate 
// subtract() method of BigDecimal 
  
import java.math.BigDecimal; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // BigDecimal object to store result 
        BigDecimal diff; 
  
        // For user input 
        // Use Scanner or BufferedReader 
  
        // Two objects of String created 
        // Holds the values to calculate the difference 
        String input1 
            = "545456468445645468464645"; 
        String input2 
            = "425645648446468486486452"; 
  
        // Convert the string input to BigDecimal 
        BigDecimal a 
            = new BigDecimal(input1); 
        BigDecimal b 
            = new BigDecimal(input2); 
  
        // Using subtract() method 
        diff = a.subtract(b); 
  
        // Display the result in BigDecimal 
        System.out.println("The difference of\n"
                           + a + " \nand\n" + b + " "
                           + "\nis\n" + diff + "\n"); 
    } 
}

输出：

The difference of
545456468445645468464645
and
425645648446468486486452
is
119810819999176981978193

subtract(BigDecimal val, MathContext mc)

用法:

public BigDecimal subtract(BigDecimal val, MathContext mc)

参数：此方法接受两个参数，一个是val，它是要从此BigDecimal中减去的值；一个是MathContext类型的mc。

返回值：此方法返回一个BigDecimal，该值保存差异(this – val)，并根据上下文设置进行舍入。

下面的程序用于说明BigDecimal的subtract()方法。

// Java program to demonstrate 
// subtract() method of BigDecimal 
  
import java.math.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // BigDecimal object to store result 
        BigDecimal diff; 
  
        // For user input 
        // Use Scanner or BufferedReader 
  
        // Two objects of String created 
        // Holds the values to calculate the difference 
        String input1 
            = "468445645468464645"; 
        String input2 
            = "4256456484464684864864"; 
  
        // Convert the string input to BigDecimal 
        BigDecimal a 
            = new BigDecimal(input1); 
        BigDecimal b 
            = new BigDecimal(input2); 
  
        // Set precision to 10 
        MathContext mc 
            = new MathContext(10); 
        // Using subtract() method 
        diff = a.subtract(b, mc); 
  
        // Display the result in BigDecimal 
        System.out.println("The difference of\n"
                           + a + " \nand\n" + b + " "
                           + "\nis\n" + diff + "\n"); 
    } 
}

输出：

The difference of
468445645468464645
and
4256456484464684864864
is
-4.255988039E+21

参考文献：https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#subtract(java.math.BigDecimal)

相关用法

注：本文由纯净天空筛选整理自Rajnis09大神的英文原创作品 BigDecimal subtract() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。