PAT Class B Java Implementation

1009. The irony (20)

time limit

400 ms

memory limit

65536 kB

code length limit

8000 B

Judgment procedure

Standard

author

CHEN, Yue

Given a sentence of English, you are asked to write a program to output all the words in the sentence in reverse order.

Input format: The test input contains a test case giving a string with a total length of no more than 80 in one line. The string consists of several words and several spaces. The word is a string composed of English letters (case-sensitive). The words are separated by a space. The input ensures that there are no extra spaces at the end of the sentence.

Output format: The output of each test case occupies one line, and the sentences in reverse order are output.

Input sample:

Hello World Here I Come

Sample output:

Come I Here World Hello

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/*Idea: Use the trim() method to remove the leading and trailing spaces from the input string,
 * Then use the split() method to divide the string into multiple character substrings with spaces as the boundary, and save them to the string array
 * The trim() and split() methods are both object methods of the String class.
 * Last traversal output in reverse order
 * */
import java.util.Scanner;
public class PAT_B_1009 //The class name is changed to Main
{
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);//Receive input string
		String[] words = in.nextLine().trim().split(" ");
		//Use the trim() method to remove the leading and trailing spaces from the input string,
		/ / Use the split() method to divide the string into multiple character substrings with spaces as the boundary, and save them to the string array
		for(int i = words.length-1; i >= 0 ; i--)
		{//Reverse order traversal, formatted output
			if(i != words.length-1)
				System.out.print(" ");
			System.out.print(words[i]);
		}
	}
}