20220716第三组张立学习笔记

知识点
习题
`package com.jr.morning;

public class Ch10 {
public static void main(String[] args) {
char[] arr = new char[]{'a', 'i', 'f', 'm', 'f', 'o', 'b', 'b', 's', 'n'};

    int [] count=new int[26];

// printCount(arr);
for (int i = 0; i < count.length; i++) {
if((printCount(arr)[i])!=0){

        System.out.println((char)(97+i)+"--"+(printCount(arr)[i]));
    }}
}
public static int[] printCount(char[] arr){
        int[] counts = new int[26];
    for (int i = 0; i < arr.length; i++) {
        counts[(char)arr[i]-97]++;
    }

    return counts;
}

}`

以上为输出数组中字母出现的次数

    //两个数组拼接成一个数组在一个数组后面
    int [] arr1=new int[]{1,2,4,5,};
    int [] arr2=new int[]{6,7,8,9};

// int [] newArr=new int[arr1.length+arr2.length];
// for (int i = 0; i < arr1.length; i++) {
// newArr[i]=arr1[i];
// }
// arr1=newArr;
// for (int j = 0; j < arr2.length ; j++) {
// arr1[arr1.length-1-j]=arr2[arr2.length-1-j];
// }
// System.out.println(Arrays.toString(arr1));

`package com.jr.morning;

import java.util.Arrays;

public class Ch5 {
public static void main(String[] args) {
int [] arr=new int[]{1,45,78,33,22,7898};

    for (int index = 1; index <arr.length ; index++) {

        while (index>0&&arr[index]<arr[index-1]){
            int temp=arr[index];
            arr[index]=arr[index-1];
            arr[index-1]=temp;
            index--;
        }
    }
    System.out.println(Arrays.toString(arr));


}

}
`
插入排序

学习心得

还差很多,继续努力

学习心情
一般,不在状态

标签：第三组,arr,20220716,int,张立,char,length,arr1,new
来源： https://www.cnblogs.com/damecss/p/16485323.html