JAVA拼合数组方法

方法一：

package org.ken.array;

import java.lang.reflect.Array;
import java.util.Arrays;

public class JoinArray {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Integer[] arr1 = new Integer[]{1,2,3};
		Integer[] arr2 = new Integer[]{4,5,6};
		Integer[] result1 = (new JoinArray()).joinArrayGeneric(arr1,arr2);
		System.out.println(Arrays.toString(result1));

		int[] arr2_1 = new int[]{1,2,3};
		int[] arr2_2 = new int[]{4,5,6};
		int[] result2 = (new JoinArray()).joinArray(arr2_1,arr2_2);
		System.out.println(Arrays.toString(result2));

	}

	 <T> T[] joinArrayGeneric(T[]... arrays) {
	       int length = 0;
	       for (T[] array : arrays) {
	           length += array.length;
	       }  

	       final T[] result = (T[]) Array.newInstance(arrays[0].getClass().getComponentType(), length);  

	       int offset = 0;
	       for (T[] array : arrays) {
	           System.arraycopy(array, 0, result, offset, array.length);
	           offset += array.length;
	       }  

	       return result;
	   } 

	 /**
	  * 合适于int
	  * @param arrays
	  * @return
	  */
	 int[] joinArray(int[]... arrays) {
	       int length = 0;
	       for (int[] array : arrays) {
	           length += array.length;
	       }  

	       final int[] result = new int[length];  

	       int offset = 0;
	       for (int[] array : arrays) {
	           System.arraycopy(array, 0, result, offset, array.length);
	           offset += array.length;
	       }  

	       return result;
	   }  

}

　　

第二种，用apache commons-lang包

int [] int1 = new int[]{1,2,3};
int[] int2 = new int[]{4,5,6};  

int[] result = ArrayUtils.addAll(int1, int2);
System.out.println(Arrays.toString(result));