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  • 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));  
    

      

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  • 原文地址:https://www.cnblogs.com/foxting/p/7088578.html
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