数组排序 (选择排序、冒泡排序、插入排序、希尔排序)

选择排序

package com.Java;
public class ArraySortSelect {
public void selectSort(int [] arr){//定义一个选择排序的方法
  for (int i = 0; i < arr.length-1; i++) {
    for (int j = i+1; j < arr.length; j++) {
      if (arr[i]>arr[j]) {
        int temp = arr[i] ;
        arr[i] = arr[j];
        arr[j] = temp ;
      }
    }
  }
}
public static void main(String[] args) {
  ArraySortSelect a = new ArraySortSelect() ;//创建一个对象,对象名为a
  int [] arr2 = {9,6,3,8,5,2,7,4,1,0};
  a.selectSort(arr2) ;//对象a调用冒泡排序的方法对arr2排序
  for (int i = 0; i < arr2.length; i++) {
  System.out.print(arr2[i]+" ");
  }
}
}

 

冒泡排序

package com.Java;
public class ArraySortBubble {
  public void bubbleSort(int arr []){
    for (int i = 0; i < arr.length; i++) {
    for (int j = 0; j < arr.length-i-1; j++) {
      if (arr[j]>arr[j+1]) {
        int temp = arr[j];
        arr[j] = arr[j+1];
        arr[j+1] = temp ;
      }
    }
  }
}
public static void main(String[] args) {
  int [] arr2 = {9,6,3,8,5,2,7,4,1,0} ;
  ArraySortBubble m = new ArraySortBubble();
  m.bubbleSort(arr2);
  for (int i = 0; i < arr2.length; i++) {
    System.out.print(arr2[i]+" ");
  }
}
}

 

插入排序

package com.Java;
public class ArraySortInsert {
public void insertSort(int [] arr){
  for(int i=1;i<arr.length;i++){
    for(int j=i;j>0;j--){
      if (arr[j-1]>arr[j]){
        int temp=arr[j-1];
        arr[j-1]=arr[j];
        arr[j]=temp;
      }
    }
  }
}
public static void main(String[] args) {
  int [] arr2 = {9,6,3,8,5,2,7,4,1,0} ;
  ArraySortInsert m = new ArraySortInsert();
  m.insertSort(arr2);
  for (int i = 0; i < arr2.length; i++) {
    System.out.print(arr2[i]+" ");
   }
}
}

 

希尔排序

package com.Java;
public class ArraySortShell {
public static void main(String[] args) {
  int[] i = { 10, 5, 6, 12, 4, 9, 3, 23, 39, 403, 596, 87 };

  System.out.println("----希尔(Shell)排序的结果:"); 

  shell(i);

}

public static void shell(int[] x) {
  for (int increment = x.length / 2; increment > 0; increment /= 2) {   // 分组 
    for (int i = increment; i < x.length; i++) {   // 每个组内排序 
      int temp = x[i];
      int j = 0;
      for (j = i; j >= increment; j -= increment) {
        if (temp < x[j - increment]) {
        x[j] = x[j - increment];
      } else {
        break;
        }
      }
      x[j] = temp;
    }
  }
  for (int i : x) {
  System.out.print(i + " ");
  }
}
}

 

posted @ 2016-11-20 13:08  温柔小怪兽  阅读(146)  评论(0编辑  收藏  举报