[daily question] the next day

️ Author： intellectuals
️ Personal blog ： Old nine CSDN Blog
Personal famous saying ： Uncontrollable things Optimistic face
Series column ： A daily topic

choice

toLowerCase Not in itself , Instead, a new object is created , The underlying source code is new A new one string, And if it is lowercase , Just go back to this, Can't new A new object

First create a new object , Inside are static methods , Static methods don't depend on objects , So it can be compiled and run correctly

The constructor of the subclass must call the constructor of the parent class , If you use super() It shows the constructor of calling the parent class ,this and super Cannot appear in the same constructor , Nor in static Use in the environment , Because it depends on objects

The object that creates the subclass calls the constructor of the parent class by default

static Cannot define local variables , Only static member variables can be defined , Nor can it be placed in static methods

abstract Fields cannot be decorated
Abstract methods cannot be bracketed

Class constructor( Construction method ) It can be omitted , Constructor must have the same name as the class , But methods can also have the same name as classes , Constructors can be overloaded

The assignment of member variables must be implemented in methods

Programming questions 1

Reverse the overall data
Then reverse each word

public class test1 {
    
    public static void reverse(char[] array,int start,int end){
    
        while(start < end){
    
            char tmp = array[start];
            array[start] = array[end];
            array[end] = tmp;
            start ++;
            end --;
        }
    }

    public static void main(String[] args) {
    
       Scanner scan = new Scanner(System.in);
       String s = scan.nextLine();
        char[] ch = s.toCharArray();
        int len = ch.length;
        // The whole is reversed 
        reverse(ch,0,len-1);
        int i = 0;// Traversal array 
        while(i<len){
    
            int j = i;
            while(j<len && ch[j] != ' '){
    
                j++;
            }
            if(j<len){
    
                reverse(ch,i,j-1);
                i=j+1;
            }else{
    
                reverse(ch,i,j-1);
                i= j;
            }
        }
        String str = new String(ch);
        System.out.println(str);
    }
}

Programming questions 2

public class test1 {
    
    public static void main(String[] args) {
    
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int [] array = new int[n+1];
        for(int i = 0;i<n;i++){
    
            array[i]=scan.nextInt();
        }
        int i = 0;
        int count = 0;
        while(i<n){
    
            if(array[i]<array[i+1]){
    
                while(i<n && array[i]<array[i+1]){
    
                    i++;
                }
                count++;
                i++;
            }else if(array[i] == array[i+1]){
    
                i++;
            }else{
    
                while(i<n && array[i]>array[i+1]){
    
                    i++;
                }
                count++;
                i++;
            }
        }
        System.out.println(count);
    }
}

————————————————————————
It's not easy to code words , Everyone's support is my driving force to stick to it
Copyright notice ： This paper is about CSDN Blogger 「 The top 100 most handsome faces in the Asia Pacific region 101 name 」 The original article of