数组的排序方法

<1>利用Arrays带有的排序方法快速排序
import java.util.Arrays;
public class Test2{
        public static void main(String[] args){
                int[] a={5,4,2,4,9,1};
                Arrays.sort(a);  //进行排序
                for(int i: a){
                        System.out.print(i);
                }
        }
}

<2>冒泡排序算法
public static int[] bubbleSort(int[] args){//冒泡排序算法
                for(int i=0;i<args.length-1;i++){
                        for(int j=i+1;j<args.length;j++){
                                if (args[i]>args[j]){
                                        int temp=args[i];
                                        args[i]=args[j];
                                        args[j]=temp;
                                }
                        }
                }
                return args;
        }

<3>选择排序算法
public static int[] selectSort(int[] args){//选择排序算法
                for (int i=0;i<args.length-1 ;i++ ){
                        int min=i;
                        for (int j=i+1;j<args.length ;j++ ){
                                if (args[min]>args[j]){
                                        min=j;
                                }
                        }
                        if (min!=i){
                        int temp=args[i];
                        args[i]=args[min];
                        args[min]=temp;       
                        }
                }
                return args;
        }

<4>插入排序算法

public static int[] insertSort(int[] args){//插入排序算法
                for(int i=1;i<args.length;i++){
                        for(int j=i;j>0;j--){
                                if (args[j]<args[j-1]){
                                        int temp=args[j-1];
                                        args[j-1]=args[j];
                                        args[j]=temp;       
                                }else break;
                        }
                }
                return args;
        }