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Java BigDecimal compareTo()用法及代碼示例


java.math.BigDecimal.compareTo(BigDecimal bg)方法檢查此BigDecimal和作為參數傳遞的BigDecimal對象bg是否相等。該方法將考慮兩個相等的BigDecimal對象,即使它們的值相等,而與小數位數無關。

用法:

public int compareTo(BigDecimal bg)

參數:此函數僅接受一個BigDecimal類型的BigDecimal對象,以便與此BigDecimal對象進行比較。


返回值:此方法可以返回以下值:

  • 0:如果此BigDecimal的值等於作為參數傳遞的BigDecimal對象的值。
  • 1:如果此BigDecimal的值大於作為參數傳遞的BigDecimal對象的值。
  • -1:如果此BigDecimal的值小於作為參數傳遞的BigDecimal對象的值。

注意:該函數在比較124.0和124.0000時返回true,因為它不比較兩個BigDecimal對象的比例。

例子:

Input:b1 = new BigDecimal("4743.0008"),  b2 = new BigDecimal("4743.00001")
        b1.compareTo(b2)
Output:1

Input:b1 = new BigDecimal(4743),  b2 = new BigDecimal("4743.00");
        b1.compareTo(b2)
Output:0

下麵的程序說明BigDecimal類的compareTo()函數的工作:
程序1:對於大於條件:

// Java program to demonstrate compareTo() method 
  
import java.io.*; 
import java.math.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating 2 BigDecimal objects 
        BigDecimal b1, b2; 
  
        b1 = new BigDecimal(67891); 
        b2 = new BigDecimal(12346); 
  
        if (b1.compareTo(b2) == 0) { 
            System.out.println(b1 + " and " + b2 + " are equal."); 
        } 
        else if (b1.compareTo(b2) == 1) { 
            System.out.println(b1 + " is greater than " + b2 + "."); 
        } 
        else { 
            System.out.println(b1 + " is lesser than " + b2 + "."); 
        } 
    } 
}
輸出:
67891 is greater than 12346.

程序2:對於相等條件:

// Java program to demonstrate compareTo() method 
  
import java.io.*; 
import java.math.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating 2 BigDecimal objects 
        BigDecimal b1, b2; 
  
        b1 = new BigDecimal(67891); 
        b2 = new BigDecimal("67891.000"); 
  
        if (b1.compareTo(b2) == 0) { 
            System.out.println(b1 + " and " + b2 + " are equal."); 
        } 
        else if (b1.compareTo(b2) == 1) { 
            System.out.println(b1 + " is greater than " + b2 + "."); 
        } 
        else { 
            System.out.println(b1 + " is lesser than " + b2 + "."); 
        } 
    } 
}
輸出:
67891 and 67891.000 are equal.

程序3:對於少於條件:

// Java program to demonstrate compareTo() method 
  
import java.io.*; 
import java.math.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Creating 2 BigDecimal objects 
        BigDecimal b1, b2; 
  
        b1 = new BigDecimal("4743.00001"); 
        b2 = new BigDecimal("4743.0008"); 
  
        if (b1.compareTo(b2) == 0) { 
            System.out.println(b1 + " and " + b2 + " are equal."); 
        } 
        else if (b1.compareTo(b2) == 1) { 
            System.out.println(b1 + " is greater than " + b2 + "."); 
        } 
        else { 
            System.out.println(b1 + " is lesser than " + b2 + "."); 
        } 
    } 
}
輸出:
4743.00001 is lesser than 4743.0008.

參考: https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#compareTo(java.math.BigDecimal)



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注:本文由純淨天空篩選整理自RICHIK BHATTACHARJEE大神的英文原創作品 BigDecimal compareTo() Function in Java。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。