借助Java NIO中的Buffer合并原始类型数组

Java的NIO包中包含了许多缓冲（Buffer）类，使用这些类可以处理所有原始数据类型的数组，用起来和ByteArrayOutputStream一样简单方便。

import java.nio.*;

public class ConcatArrays {

    public static void main(String[] args) {
        int[] myNumbers=new int[]{1,2,3,4};
        int[] yourNumbers=new int[]{5,6,7};
        int[] theirNumbers=new int[]{8,9,0};

        //按需要分配buffer        
        IntBuffer intBuffer = IntBuffer.allocate(myNumbers.length+yourNumbers.length+theirNumbers.length);

        //放入到buffer        
        intBuffer.put(myNumbers);
        intBuffer.put(yourNumbers);
        intBuffer.put(theirNumbers);

        //得到合并后的数组        
        int[] allNumber = intBuffer.array();

        //显示合并后的数组        
        for (int i :allNumber ) {
            System.out.print(i);
            System.out.print(", ");
        }


        //各种数据原始类型都有buffer可用，非常方便        
        LongBuffer longBuffer = LongBuffer.allocate(10);
        DoubleBuffer doubleBuffer = DoubleBuffer.allocate(10);
        FloatBuffer floatBuffer = FloatBuffer.allocate(10);
        ByteBuffer byteBuffer = ByteBuffer.allocate(10);
        ShortBuffer shortBuffer = ShortBuffer.allocate(10);
        CharBuffer charBuffer = CharBuffer.allocate(10);
    }
}