Java invert array output instance code

Invert array output

Preface:This method comes from the B station UP master

question:Invert the numbers 1,2,3,4,5 output 5,4,3,2,1

Input parameters: 1, 2, 3, 4, 5

Code Example

public static void main(String[] args) {
  //parameter  int[] array = {1,2,3,4,5};
  //Calling method  int[] a = a(array);
  //The result output of the call  (a);
 }

 public static int[] a(int[] array){
  //Declare a dynamic initialization array; receive inverted array  int[] res = new int[];
  /*
    Loop through the parameter array

    i: For normal initialization statement, we know the array size and end with 0.
    j: Find the maximum length of dynamically initialized array

    i: Step size increases by itself every time
    j: Step length is self-decreasing
    */
  for (int i = 0,j=-1; i < ; i++,j--) {
   /*
     Parameter array value Assign to declare dynamically initialize the array
     The first time loop i:0 j:4 and so on i:1 j:3
     */
    res[j] = array[i];
  }
  return res;
 }

Output result: 5, 4, 3, 2, 1

Java implements reverse string output

【Title Description】

Write a function to store an input string in reverse order, and input and output the inverted string in the main function.

【enter】

One line of characters

【Output】

String after reverse order

【Sample input】

123456abcdef

【Sample output】

fedcba654321 

【Problem Solving Ideas】

First, define two String strings a and b, where a is used to store the string in the positive order and b is used to store the reverse order string. Then define a character array c, and then call the toCharArray() method in the class library to convert the string into character numbers. Then, use a loop to assign the character array inversely to the string b, and then output the string b.

【source code】

import ;
 
public class Main {
 public static void main(String[] args) {
 Scanner scanner = new Scanner();
 
 String a = ();
 String b = "";
 
 char[] c = ();
 
 for(int i = -1;i >= 0;i--) {
  b = b + c[i];
 }
 
 (b);
 
 ();
 }
}

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