Java编程

一、冒泡排序：

public static void main(String[] args) {
        int[] li ={1,4,5,2,33,22,33};
        System.out.println(li);
        for (int i = 0; i < li.length-1; i++) {
            for (int j = 0; j < li.length-i-1; j++) {
                if (li[j]>li[j+1]){
                    int swap = li[j];
                    li[j] = li[j+1];
                    li[j] = swap;
                }
            }
        }
        for (int i:li) {
            System.out.println(i);
        }
    }

二、快速排序：

public class SortedTest2 {
    public static void Sort(int[] a,int low,int height){
        int i=low;
        int j=height;
        if (i>j){
            return;
        }
        int k=a[i];
        while (i<j){
            while (i<j && a[j]>k){
                j--;
            }
            while (i<j&&a[i]<=k){
                i++;
            }
            if(i<j){
                int swap = a[i];
                a[i]=a[j];
                a[j]=swap;
            }
        }
        k=a[i];
        a[i]=a[low];
        a[low]=k;

        Sort(a,low,i-1);
        Sort(a,i+1,height);
    }

    public static void main(String[] args) {
        int[] arr = {4,5,3,55,22,44,77};
        Sort(arr,0,arr.length-1);
        for (int i:arr) {
            System.out.println(i);
        }
    }
}

三、判断字符串是否对称

public static Boolean test（String s）{
     for(int i=0;i<=s.length()/2;i++){
         if(s.charAt(i) != s.charAt(s.length()-i-1){
             return false;
         }
     }
     return true;        
}