Java day_03

import java.net.SocketOption;
import java.util.Scanner;

public class day_3 {
    public static void main(String[] args) {
        test1();
        test2();
        test3();
        test4();
        test5();
        test6();
        test7();
        test8();
    }
    public static void test1(){
        int[] array=new int[4];
        array[0]=23;
        array[1]=45;
        array[2]=3;
        array[3]=17;
        System.out.println(array[0]);
        System.out.println(array);
        System.out.println(array[array.length-1]);
        System.out.println("--------------");
        for (int i=0;i<array.length;i++){
            System.out.println(array[i]);
        }
        System.out.println("---------------");
        for (int j=array.length-1;j>=0;j--){
            System.out.println(array[j]);
        }
    }
    public static void test2(){
        int[] array=new int [4];
        array[0]=23;
        array[1]=45;
        array[2]=3;
        array[3]=17;
        int sum=0;
        for (int i=0;i<array.length;i++){
            sum+=array[i];
        }
        System.out.println(sum);
    }
    public static void test3() {
        int[] scores={0,0,1,2,3,5,4,5,2,8,7,6,9,5,4,8,3,1,0,2,4,8,7,9,5,2,1,2,3,9};
        int[] countArray=new int[10];
        for (int i=0;i< scores.length;i++){
            switch(scores[i]){
                case 0:
                    countArray[0]++;
                    break;
                case 1:
                    countArray[1]++;
                    break;
                case 2:
                    countArray[2]++;
                    break;
                case 3:
                    countArray[3]++;
                    break;
                case 4:
                    countArray[4]++;
                    break;
                case 5:
                    countArray[5]++;
                    break;
                case 6:
                    countArray[6]++;
                    break;
                case 7:
                    countArray[7]++;
                    break;
                case 8:
                    countArray[8]++;
                    break;
                case 9:
                    countArray[9]++;
                    break;
            }
        }
        for (int j=0;j<countArray.length;j++){
            System.out.println(j+"出现的次数:"+countArray[j]);
        }
    }
    public static void test4(){
        int[] score = {0,0,1,2,3,5,4,5,2,8,7,6,9,5,4,8,3,1,0,2,4,8,7,9,5,2,1,2,3,9};
        int oddCount=0;
        int evenCount=0;
        for (int i=0;i<score.length;i++){
            if(score[i]%2==0){
                evenCount++;
            }else{
                oddCount++;
            }
        }
        System.out.println("odd:"+oddCount);
        System.out.println("even:"+evenCount);
    }
    public static void test5(){
        Scanner scanner=new Scanner(System.in);
        System.out.println("Please Enter Student's num:");
        int num=scanner.nextInt();
        double[] array=new double[num];
        int sum=0;
        for (int i=0;i<array.length;i++){
            System.out.println("Please Enter "+(i+1)+"Student's score:");
            array[i]=scanner.nextDouble();
            sum+=array[i];
        }
        System.out.println("average:"+sum/array.length);
    }
    public static void test6(){
        Scanner scanner=new Scanner(System.in);
        System.out.println("Please Enter a str:");
        String str=scanner.next();
        char[] array=str.toCharArray();
        boolean ishuiwen=true;
        for (int i=0;i<array.length;i++){
            if(array[i]!=array[array.length-i-1]){
                ishuiwen=false;
                break;
            }
        }
        if (ishuiwen){
            System.out.println("is huiwen.");
        }else{
            System.out.println("not huiwen.");
        }
    }
    public static void test7(){
        Scanner scanner=new Scanner(System.in);
        System.out.println("Please Enter a str:");
        String str=scanner.nextLine();
        char[] array=str.toCharArray();
        int digitalCount=0;
        int charCount=0;
        int blankCount=0;
        int otherCount=0;
        for (int i=0;i<array.length;i++){
            if (array[i]>='0'&&array[i]<='9'){
                digitalCount++;
            }else if (array[i]>='a'&&array[i]<='z'||array[i]>='A'&&array[i]<='Z'){
                charCount++;
            }else if (array[i]==' '){
                blankCount++;
            }else{
                otherCount++;
            }
        }
        System.out.println("digitaolcount:"+digitalCount);
        System.out.println("charcount:"+charCount);
        System.out.println("blankcount:"+blankCount);
        System.out.println("othercount:"+otherCount);
    }
    public static void test8(){
        Scanner scanner=new Scanner(System.in);
        System.out.println("Please Enter x:");
        int x=scanner.nextInt();
        System.out.println("Please Enter y:");
        int y=scanner.nextInt();
        System.out.println("Please Enter z:");
        int z=scanner.nextInt();
        if (x>y){
            int temp=x;
            x=y;
            y=temp;
        }
        if (x>z){
            int temp=x;;
            x=z;
            z=temp;
        }
        if (y>z){
            int temp=y;
            y=z;
            z=temp;
        }
        System.out.println("x:"+x+"\n"+"y:"+y+"\n"+"z:"+z);
    }
}