• java 平时作业三


    自定义一个可以存储int类型的集合类(例如:SequenceList),封装一维数组存储数据,该集合类具有以下方法:
    (1)新增元素;
    (2)在指定位置插入一个元素;
    (3)按位置删除元素;
    (4)按值删除元素
    (5)排序(增序,降序)
    (6)查询指定元素,返回下标位置。

      1 package hi;
      2 
      3 public class SequenceList {
      4 
      5     /**
      6      * @param args
      7      */
      8     // Int类型的集合类
      9         int array[]= { 0,1,2,3,4,5,6,7,8,9 };
     10         
     11         
     12         void show() {
     13             for (int i = 0; i < array.length; i++) {
     14                 System.out.print(array[i]+"  ");
     15             }
     16             System.out.println("");
     17         }
     18         
     19         void addElement(int a){
     20             int [] newArray = new int[array.length+1];
     21             
     22             for (int i = 0;i<array.length;i++){
     23                 newArray[i] = array[i];
     24             }
     25             newArray[array.length] = a;
     26             array = newArray;
     27             show();
     28         }
     29         void addElementAtIndexof(int a,int index){
     30             index--;
     31             int[] newArray = new int[array.length+1];
     32             
     33             for (int i=0;i<index;i++)
     34             {
     35                 newArray[i] = array[i];
     36             }
     37             
     38             newArray [index] = a;
     39             
     40             for (int i = index + 1; i <= array.length; i++) {
     41                 newArray[i] = array[i - 1];
     42             }
     43             array = newArray;
     44             show();
     45         }
     46         void deleteElementAtIndexOf(int index) {
     47             int[] newArray = new int[array.length - 1];
     48 
     49             for (int i = 0; i < index - 1; i++) {
     50                 newArray[i] = array[i];
     51             }
     52 
     53             for (int i = index; i < array.length; i++) {
     54                 newArray[i - 1] = array[i];
     55             }
     56             array = newArray;
     57             show();
     58         }
     59         void deleteElement(int a) {
     60             for (int i = 0; i < array.length; i++) {
     61                 if (a == array[i]) {
     62                     deleteElementAtIndexOf(i + 1);
     63                 }
     64             }
     65 
     66         }
     67         int elementAt(int a) {
     68             return 0;
     69         }
     70         public void arraySortDown() {
     71 
     72             for (int i = 0; i < array.length; i++) {
     73                 for (int j = i + 1; j < array.length; j++) {
     74                     if (array[i] < array[j]) {
     75                         int temp = array[i];
     76                         array[i] = array[j];
     77                         array[j] = temp;
     78                     }
     79                 }
     80             }
     81             show();
     82         }
     83 
     84         public void arraySortUp() {
     85             
     86             for (int i = 0; i < array.length; i++) {
     87                 for (int j = i + 1; j < array.length; j++) {
     88                     if (array[i] > array[j]) {
     89                         int temp = array[i];
     90                         array[i] = array[j];
     91                         array[j] = temp;
     92                     }
     93                 }
     94             }
     95             show();
     96         }
     97         public void arraySortIndexof(int a)
     98         {
     99             int index2=0;
    100             for (int i = 0; i < array.length; i++) {
    101                 if (a == array[i]) {
    102                     index2=i;
    103                     break;
    104                 }
    105             }
    106             System.out.println(index2);
    107         }
    108     
    109 
    110     public static void main(String[] args) {
    111        SequenceList test = new SequenceList();
    112        test.addElement(10);
    113        test.addElementAtIndexof(9, 1);
    114        test.deleteElementAtIndexOf(3);
    115        test.deleteElement(3);
    116        test.arraySortUp();
    117        test.arraySortDown();
    118        test.arraySortIndexof(4);
    119     }
    120 
    121 }
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  • 原文地址:https://www.cnblogs.com/CheeseIce/p/10572422.html
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