Java 中 NumberFormat setRoundingMode()方法，带示例

原文:https://www . geesforgeks . org/number format-setroundingmode-method-in-Java-with-examples/

设置舍入模式()方法是 java.text.NumberFormat 的内置方法，用于设置此 NumberFormat 中使用的舍入模式。处理不同舍入模式的子类应该覆盖这个方法。

语法:

public void setRoundingMode(RoundingMode mode)

参数:该功能接受一个强制参数模式，指定要设置的模式。

返回值:该函数不返回任何内容，因此返回类型为 void。

异常:函数抛出两个异常，描述如下:

  • 不支持操作异常:如果默认实现总是抛出这个异常
  • 空指针异常:如果舍入模式为空

下面是上述功能的实现:

程序 1 :

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {

        NumberFormat nF
            = NumberFormat.getNumberInstance();

        System.out.println("set initially as: "
                           + nF.getRoundingMode());

        // Set grouping
        nF.setRoundingMode(RoundingMode.FLOOR);

        // Print the final
        System.out.println("set finally as: "
                           + nF.getRoundingMode());
    }
}

Output: 

set initially as: HALF_EVEN
set finally as: FLOOR

程序 2:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {

        NumberFormat nF
            = NumberFormat.getNumberInstance();

        System.out.println("set initially as: "
                           + nF.getRoundingMode());

        // Set grouping
        nF.setRoundingMode(RoundingMode.DOWN);

        // Print the final
        System.out.println("set finally as: "
                           + nF.getRoundingMode());
    }
}

Output: 

set initially as: HALF_EVEN
set finally as: DOWN

程序 3:

Java 语言(一种计算机语言，尤用于创建网站)

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {
        try {

            NumberFormat nF
                = NumberFormat.getNumberInstance();

            System.out.println("set initially as: "
                               + nF.getRoundingMode());

            // Set grouping
            nF.setRoundingMode(null);

            // Print the final
            System.out.println("set finally as: "
                               + nF.getRoundingMode());
        }
        catch (Exception e) {
            System.out.println("Exception is: "
                               + e);
        }
    }
}

Output: 

set initially as: HALF_EVEN
Exception is: java.lang.NullPointerException

参考:https://docs . Oracle . com/javase/10/docs/API/Java/math/roundingmode . html

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