如何检查字符是否等于空格？

Question

I need to check if the array of character [i] equal space or not

Please look at the code:

import java.util.Scanner;

public class Main {
public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    System.out.println("\tplease enter text");
    System.out.print("\t");
    String text = in.next();

    for(int i =0;i<text.length();i++)
    {
        if(text.charAt(i) == 'a') // case a
        {
            System.out.println("it is  > a");
        }
        else if(text.charAt(i) == ' ') // case space
        {
            System.out.println("it is a  > space");
        }
    }
    
    
}// main

}

Whene (text.charAt(i) == ' ') TRUE It doesn't do the statement

Answer 1

text.charAt(i) == ' ' will not be true since you use Scanner 's next method and thus your text variable will not contain a space.

By default a Scanner 's delimeter is whitespace, so your call of

String text = in.next();

will cause text to only contain data up until the first space of your input. You can verify this using a System.out.println(text) .

Use String text = in.nextLine(); instead.