删除数组中重复的元素

      如题，删除数组中的重复元素，并保持顺序，下面是我的实现：

     

import java.util.Arrays;


public class RemoveDuplate {
	public static void main(String[] args) {
		 int arr[]={4,2,4,6,1,2,4,7,8};
         System.out.println(Arrays.toString(repeat(arr)));
	}
	
	public static int[] repeat(int [] arr){
		  if(arr == null){
			  return arr;
		  }
		  
		  int arrayLength = arr.length;
		  if(arrayLength == 0){
			  return arr;
		  }
		  
		  int duplicateCount = 0;
		  boolean[] flags = new boolean[arrayLength];
		  for(int i = 0; i < arrayLength; i++){
			  if(flags[i]){
				  continue;
			  }
			  for(int j = i + 1; j < arrayLength; j++){
				  if(arr[i] == arr[j]){
					  flags[j] = true;
					  duplicateCount++;
				  }
			  }
		  }
		  
		  int[] noDuplicateArray = new int[arrayLength - duplicateCount];
		  int index = 0;
		  for(int i = 0; i < arrayLength; i++){
			  if(!flags[i]){
				  noDuplicateArray[index++] = arr[i];
			  }
		  }
		  
		  return noDuplicateArray;
	}
}