java - Finde positive and negative numbers from Array? -

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i have 1 assignment , need . int[] array={12,23,-22,043,545,-4,-55,43,12,0,-99,-87} , must make 2 array. first positive , second negative , duplicate nubers . can not use arraylist.

int[] array={12,23,-22,0,43,545,-4,-55,43,12,0,-999,-87};

       for(int i=0;i<array.length;i++){              if(array[i]>0){               system.out.println("positive:"+array[i]);                          }           else if                 (array[i]<0){                system.out.println("negative:"+array[i]);               }            (int j = + 1; j < array.length; j++) {             if (array[j] ==array[i]) {                  system.out.println("dup:"+array[j]);      }  }        } }

res is:run: postive:12 dupli:12 postive:23 negative:-22 dupli:0 postive:43 dupli:43 postive:545 negative:-4 negative:-55 postive:43 postive:12 negative:-999 negative:-87 build successful (total time: 0 seconds) don know how postive: 12,23,0,43,545, etc.

try understand code , answer professor, 

 int[] array={12,23,-22,043,545,-4,-55,43,12,0,-99,-87};    list<integer> postivenumbers=new arraylist<integer>();     list<integer> negativenumbers=new arraylist<integer>();     list<integer> duplicatenumbers=new arraylist<integer>();     for(int i=0;i<array.length;i++){         if(!(postivenumbers.contains(array[i])||negativenumbers.contains(array[i]))) {//checks whether contains duplicates              if (array[i] >= 0) {                 postivenumbers.add(array[i]);             } else if (array[i] < 0) {                 negativenumbers.add(array[i]);             }         }         else duplicatenumbers.add(array[i]);     }      system.out.println(postivenumbers);     system.out.println(negativenumbers);     system.out.println(duplicatenumbers);

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