有不等于char的地方吗 [英] is there a not equals for char

问题描述

我正在尝试将其添加到此代码中

I''m trying to add it to this code

char input;
String state = in.next();
 input = state.charAt(0);
 do
 {
     System.out.println("Please enter a command type:");
 }while(!input);

推荐答案

没有，没有.但是，如果字符串input为空，则charAt方法将引发IndexOutOfBoundsException(请参见

Nope, there is not. However, if the string input is empty then the charAt method throws the IndexOutOfBoundsException (see the documentation[^]).
What are you trying to do?

尝试这个

Scanner in=new Scanner(System.in);
		char ch ;
		do{
			System.out.println("Enter the a character");
		try{
			ch= in.nextLine().charAt(0);
			System.out.println("Char: "+ch);			
		}
		catch (IndexOutOfBoundsException e) {
		      ch = 'z';
		}			
		}while(ch < 'a' || ch > 'g');

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