方法一：

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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

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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));