Java ChoiceFormat previousDouble()用法及代碼示例

java.text.ChoiceFormat類的previousDouble()方法用於獲取雙精度值，該雙精度值小於傳遞的雙精度值。

用法:

public static final double previousDouble(double d)

參數：此方法接受雙精度值d作為參數，並為其返回前一個雙精度值。

返回值：此方法返回的double值比傳遞的double值小。

下麵是說明previousDouble()方法的示例：

示例1:

// Java program to demonstrate 
// previousDouble() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        // getting double value just 
        // lesser than the passed value 
        // using previousDouble() method 
        double value 
            = ChoiceFormat.previousDouble(22); 
  
        // display the result 
        System.out.print("Lesser double value: "
                         + value); 
    } 
}

輸出：

Lesser double value: 21.999999999999996

示例2:

// Java program to demonstrate 
// previousDouble() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        // calling getValue() mehtod 
        getValue(1.23d); 
        getValue(10d); 
        getValue(-12d); 
        getValue(1.2f); 
        getValue(50); 
    } 
  
    // defining getValue() mehtod 
    public static void getValue(double doub) 
    { 
  
        // getting double value just 
        // lesser than the passed value 
        // using previousDouble() method 
        double value 
            = ChoiceFormat.previousDouble(doub); 
  
        // display the result 
        System.out.println("Just lesser than "
                           + doub + ": "
                           + value); 
    } 
}

輸出：

Just lesser than 1.23: 1.2299999999999998
Just lesser than 10.0: 9.999999999999998
Just lesser than -12.0: -12.000000000000002
Just lesser than 1.2000000476837158: 1.2000000476837156
Just lesser than 50.0: 49.99999999999999

參考： https://docs.oracle.com/javase/9/docs/api/java/text/ChoiceFormat.html#previousDouble-double-

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 ChoiceFormat previousDouble() method in Java with Examples。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。