Java-数组-冒泡排序+二分查找

    Java-数组-冒泡排序+二分查找

    可自行键入数组元素和需要查找的元素

package com.lu.test;

import java.util.Scanner;


public class ErFen {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        //新建数组，设置数组长度
        int[] array = new int[6];
        //手动键入数组
        for(int i = 0;i < array.length;i++){
            array[i] = scan.nextInt();
        }
        //冒泡排序
        int temp = 0;
        for(int i = 0;i < array.length - 1;i++){
            for(int j = 0;j < array.length - i - 1;j++){
                if (array[j] >= array[j + 1]) {
                    temp = array[j];
                    array[j] = array[j + 1];
                    array[j + 1] = temp;
                }
            }
        }
        //输出数组
        for(int i = 0;i < array.length;i++){
            System.out.print(array[i] + "t");
        }
        System.out.println();

        //二分查找
        int target = 6;
        int head = 0;//初始首索引
        int end = array.length - 1;//初始末索引
        boolean isFlag = false;

        while (head <= end){
            int middle = (head + end) / 2;
            if(array[middle] == target){
                System.out.println("found in "+ "array[" + middle + "]");
                isFlag = true;
                break;
            }else if(array[middle] > target){
                end = middle - 1;
            }else{
                head = middle + 1;
            }
        }
        //数组中不存在该元素
        if(isFlag == false){
            System.out.println("404 not found");
        }
    }
}