|
| 1 | +package arrays; |
| 2 | + |
| 3 | +import java.util.ArrayList; |
| 4 | +import java.util.Arrays; |
| 5 | +import java.util.List; |
| 6 | + |
| 7 | + |
| 8 | + |
| 9 | +public class ArrayUtils { |
| 10 | + |
| 11 | + public Integer[] merge(Integer[] array1, Integer[] array2){ |
| 12 | + |
| 13 | + List<Integer> returnedList = new ArrayList<Integer>(); |
| 14 | + List<Integer> concatList = array1 != null ? new ArrayList<Integer>(Arrays.asList(array1)) : |
| 15 | + (array2 != null ? new ArrayList<Integer>(Arrays.asList(array2)) : new ArrayList<Integer>()) ; |
| 16 | + if(array2 != null && array2 != null) |
| 17 | + concatList.addAll(Arrays.asList(array2)); |
| 18 | + |
| 19 | + for(Integer element2: concatList){ |
| 20 | + |
| 21 | + if(returnedList.indexOf(element2) == -1){ |
| 22 | + returnedList.add(element2); |
| 23 | + } |
| 24 | + |
| 25 | + } |
| 26 | + return (Integer[]) returnedList.toArray(new Integer[returnedList.size()]); |
| 27 | + } |
| 28 | + |
| 29 | + public Integer[] innerJoin(Integer[] array1, Integer[] array2){ |
| 30 | + |
| 31 | + List<Integer> returnedList = new ArrayList<Integer>(); |
| 32 | + |
| 33 | + for(Integer element1: array1){ |
| 34 | + |
| 35 | + for(Integer element2: array2){ |
| 36 | + if(element2 == element1){ |
| 37 | + returnedList.add(element1); |
| 38 | + break; |
| 39 | + } |
| 40 | + } |
| 41 | + } |
| 42 | + |
| 43 | + return (Integer[]) returnedList.toArray(new Integer[returnedList.size()]); |
| 44 | + } |
| 45 | + |
| 46 | + public Integer[] leftJoin(Integer[] array1, Integer[] array2){ |
| 47 | + |
| 48 | + List<Integer> returnedList = array1 != null ? new ArrayList<Integer>(Arrays.asList(array1)) : |
| 49 | + (array2 != null ? new ArrayList<Integer>(Arrays.asList(array2)) : |
| 50 | + new ArrayList<Integer>()); |
| 51 | + if(array1 != null){ |
| 52 | + for(Integer element2: array2){ |
| 53 | + |
| 54 | + if(returnedList.indexOf(element2) > -1){ |
| 55 | + returnedList.add(element2); |
| 56 | + } |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + return (Integer[]) returnedList.toArray(new Integer[returnedList.size()]); |
| 61 | + } |
| 62 | + |
| 63 | + public Integer[] outerJoin(Integer[] array1, Integer[] array2){ |
| 64 | + |
| 65 | + List<Integer> returnedList = new ArrayList<Integer>(); |
| 66 | + List<Integer> concatList = array1 != null ? new ArrayList<Integer>(Arrays.asList(array1)) : |
| 67 | + (array2 != null ? new ArrayList<Integer>(Arrays.asList(array2)) : new ArrayList<Integer>()) ; |
| 68 | + if(array1 != null && array2 != null) |
| 69 | + concatList.addAll(Arrays.asList(array2)); |
| 70 | + |
| 71 | + for(Integer element1: concatList){ |
| 72 | + if(concatList.indexOf(element1) == concatList.lastIndexOf(element1)){ |
| 73 | + returnedList.add(element1); |
| 74 | + } |
| 75 | + } |
| 76 | + |
| 77 | + return (Integer[]) returnedList.toArray(new Integer[returnedList.size()]); |
| 78 | + } |
| 79 | + |
| 80 | +} |
0 commit comments