Example analysis of Java string reverse order method

1. Brief description

Record two methods to achieve string reverse order:

• The first method is more violent, through The subscript of the string reverses the string. The substring() method of the String class is used here. This method is more commonly used, so I won’t write it down in detail.

• The second method is Convert the String class into the StringBuffer class, and reverse the string by calling the reverse() method of the StringBuffer class. This method is relatively simple

The following is the implementation code of the two methods:

public class test_2_13 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String a = "123456";

        String one = "";
        String two = "";

        // 方法一：
        for (int i = 0; i < a.length(); i++) {
            one += a.substring(a.length() - 1 - i, a.length() - i);
        }

        // 方法二：
        StringBuffer stringBuffer = new StringBuffer(a);
        two = stringBuffer.reverse().toString();

        System.out.println("方法一输出效果:" + one);
        System.out.println("方法二输出效果:" + two);

    }

}

##Description:

Convert a The contents of the string str are reversed and output.

Data range: 1 \le len(str) \le 10000\1≤len(str)≤10000

Input description:

Input a string, there can be spaces

Output description:

Output the string in reverse order

Example 1

Input:

I am a student

Copy Output:

tneduts a ma I

Example 2

Input:

nowcoder

Copy output:

redocwon

2. Code implementation

import java.util.*;

public class Main {

    private String reverse(String str) {
        StringBuilder res = new StringBuilder(str);
        return res.reverse().toString();
    }

    public Main() {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String str = in.nextLine();
            String res = reverse(str);
            System.out.println(res);
        }
   }

    public static void main(String[] args) 
    {
        Main solution = new Main();
    } 
}

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