# Java.math.BigInteger.toByteArray()方法範例

java.math.BigInteger.toByteArray() 返回一個包含此BigInteger的二進位制二補數表示的位元組陣列。位元組陣列將在big-endian位元組順序：最顯著位元組在第零個元素。

## 宣告

`public byte[] toByteArray()`

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## 例子

```package com.yiibai;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

// create 2 BigInteger objects
BigInteger bi1, bi2;

// create 2 byte arrays
byte b1[], b2[];

// create and assign value to byte array b3
byte b3[] = { 0x1, 0x00, 0x00 };

bi1 = new BigInteger("10");
bi2 = new BigInteger(b3); // using byte[] constructor of BigInteger

// assign byte array representation of bi1, bi2 to b1, b2
b1 = bi1.toByteArray();
b2 = bi2.toByteArray();

String str1 = "Byte array representation of " + bi1 + " is: ";

System.out.println( str1 );

// print byte array b1 using for loop
for (int i=0; i  < b1.length; i++)
{
System.out.format("0x%02X
", b1[i]);
}

String str2 = "Byte array representation of " + bi2 + " is: ";

System.out.println( str2 );

// print byte array b2 using for loop
for (int j=0; j < b2.length; j++)
{
System.out.format("0x%02X ", b2[j]);
}
}
}```

```Byte array representation of 10 is:
0x0A
Byte array representation of 65536 is:
0x01 0x00 0x00```