Java.math.BigDecimal.byteValueExact()方法

java.math.BigDecimal.byteValueExact() 轉換將BigDecimal為一個位元組，檢查丟失的資訊。如果此BigDecimal具有非零小數部分，或者超出的可能範圍，位元組的結果則丟擲ArithmeticException。

宣告

`public byte byteValueExact()`

• NA

Exception

• ArithmeticException - 如果BigDecimal物件的具有非零小數部分，或者不適合以位元組形式。

例子

```package com.yiibai;

import java.math.*;

public class BigDecimalDemo {

public static void main(String[] args) {

// create 2 BigDecimal objects
BigDecimal bg1, bg2;

// Create 2 byte objects
byte i1, i2;

// assign values to bg1 and bg2
bg1 = new BigDecimal("-128");
bg2 = new BigDecimal("48");

// any BigDecimal value greater than 127 or less than -128,
// will generate exception as it doesn't fit in byte range

// this	method also generates exception for decimal values like 12.10

// assign the byte value of bg1 and bg2 to i1,i2 respectively
i1 = bg1.byteValueExact();
i2 = bg2.byteValueExact();

String str1 = "Exact byte value of " + bg1 + " is " + i1;
String str2 = "Exact byte value of " + bg2 + " is " + i2;

// print i1,i2 values
System.out.println( str1 );
System.out.println( str2 );
}
}```

```Exact byte value of -128 is -128
Exact byte value of 48 is 48```